MalikA, you don't say how long you've had the birds. If it's only been a very short time (say, a week or two), I'd just sit back for the moment and let them settle in. Moving house can be very stressful for birds and likewise a change of owners: it's enough to make them want to bite sometimes.
I had never heard of pellets until I came here. I just fed my birds 'birdseed' in the appropriate size! LOL! I have a pair of Alexandrines, which are longer but lighter than your birds. Each day, I give them a cup each of Vetafarm Nutriblend pellets and a cup each of chopped mixed vegetables. There's a very good article here on the forum about changing from a seed to a pelleted diet. Just click the 'Search' button up in the blue toolbar and type in 'change from seed' or 'healthy diet' and it should pop up. Since my birds have been eating seeds, they have gained weight and muscle mass and their feathers are cleaner and much more healthy. Pellets might be a bit $$$, but it's *so* worth it to see the blooming health of your birds!
I give veggies half in the morning and half in the afternoon because it's very hot here in Australia at the moment and the veg can go off very quickly. Fresh raw veg is best and there are lots of lists online and here on the forum of varieties you can feed. If push comes to shove, you can use frozen mixed veggies and microwave them until just defrosted (NOT warm). It is far better to use fresh, though, and your birds will show the benefits in good health and feather. Many people here also allow their birds to share vegetables etc from their plate. I wish I could do that, but if I did, I'd die of malnutrition (my birds are very greedy)!
Each day, I also offer my birds some fruit. Most people, I believe, offer a mixture of fruits, but I'm afraid I can only offer what I have. Right now, that's an apple, a pear or a banana. What I usually do is slice up a fruit or two and just keep offering pieces until they stop asking for it. I eat what they don't. Easy!
Fresh water is available at *all* times and in the summer heat over here I change water three or four times a day. Depends on how often they poop or drop food in as well. One useful tip that many beginners don't usually get is: 'do not place the water dish beneath a perch or close to the cage wall. If you do, there *will* be poop!'
What else? You need to be careful of metal objects you place in your cage. If they're not bird safe, your birds could die an awful death. Stainless steel is the preferred metal, but if your toy or dish or whatever is labelled 'bird safe', it should be OK. Also be careful not to let your birds to have access to house plants or unknown timbers. Some are very toxic to birds and again, there are lists here and elsewhere online to help you.
Many of us use newspaper or other papers to line the cage bottom. This helps enormously with cleaning: you just roll it up, discard and replace! Some people like to use the floor grille to allow poop to pass through and onto a paper-lined bottom tray (and therefore out of the birds' reach), but I'm one of those who covers it with paper. My birds don't spend any time on the floor, therefore they're not likely to wind up anointed with poop. You'll need to decide what suits you.
With my pair, I always have them out of cage together. Many people won't do that and prefer to separate pairs in order to bond more strongly with each bird. That hasn't been my experience and my birds love me and I love them! They have vastly different personalities and Madge, my girl, is much more nippy than her boyfriend, Barney. She's also the one who loves to fly and fly and fly around while Barn likes to just sit and chill on my arm (bless 'im). Madge has learned a few tricks, but would really rather be flying or chewing on my house and it's appointments. Barney is much more focussed and has learned lots of tricks and is always ready to learn more.
With my pair, they like a bath on some days and on other days they don't. For reasons I don't fully understand, they won't bathe in a container of water. They prefer to be misted with a squirt bottle. I just pick it up and give a squirt or two over the sink and if it's going to be a bath-day, I'll suddenly have a large animated green hat on my head. I'll hold out my arm and they descend with all their feathers fluffed up, bowing and nodding and fanning their tails to let the water in to their skin. When they've had enough, they fly away. I go and dry myself off then. (!!!) Other birds like a deep or shallow bath to sink in. You'll need to experiment with yours to find out what they like. But do try to get them fully wet at least once a week, if not more. It keeps their skin clean and helps prevent itching that can lead to feather plucking.
If you go to YouTube and search for 'parrot training' or 'aggressive parrot' or 'biting parrot' or 'training a parrot to step up', you'll find lots of useful tips. One of the best I've seen is by a person called Barbara Heidenreich: she has a neat way of holding the end of a perch and luring the bird onto her hand sideways by offering a treat. With biting, the best advice I've been given is to put something in the bird's beak (either a bit of food or a stick). While his beak is full, he can't be biting you! We save our chopsticks for exactly this purpose. Also, when you offer the biting bird your hand, ball up your fist and offer the stretched skin on the back of your hand: in that way, he can't get hold of much to bite on. If he's sitting on your arm and bites, rock your arm back and forth so that he has to regain his balance with his wings, then put him down as soon as you can. Don't ever yell at or hit a bird: it doesn't work and will only put him against you.
And that's all I can think of at the moment. I'm not an expert and most of this info has been picked up right here from the people who are (experts, I mean).

If you have questions, ask them! What we all want is for you to enjoy your birds and become an expert in time! LOL! Also, we'd like to know their names...
