Here's what it was looking like for a while-
There was just too many perches and too little room. In a cage Wendy's size, that many perches would probably be ideal, but not in a cage the size of Kiwi's cage.
The noise Kiwi makes is very high pitched and almost sounds like the squealing noise a large semi truck makes when it's breaking

So cute! And Taw is right, it'll take some time to learn Whisper's special birdie "language" but in time you'll know what's a happy squeak and a squeak of "I'm going to bite now", or a happy flaring of the tail showing how pretty he is and a aggressive "look at how mean I am". Or pinning out of intrigue and intelligence and pinning out of anger and aggression. Our feathered friends do communicate, you just have to watch and listen
And this may be a good "first toy" to create because it's easy and can use just about any spare part you have

All you need is a soft plastic food container, a large needle (to pierce the container) and some bird-friendly cord. Then just tie toys to it!
Edit: We have a "no no" line on our stick. Basically a big bright piece of duct tape around the center of the stick. Kiwi stays on his side, I stay on mine. When he was new I devised this because he wanted to crawl up the stick to bite me. I started backing him off with whatever was handy (usually a big plastic spoon) and tapping the line with it so he understood "go past this line, get backed down". He does not cross the line anymore, even if he's REALLY mad. I also use the stick regularly, even when he's in a good mood. That way he does not associate the stick with "being in trouble", it's just another part of his daily routine and gets less protest when he is pissed

I know this sounds totally stupid, but theres a show called "Super Nanny" where this last instructs parents how to get their kids under control. Many of the concepts in that show they're using on misbehaving small children can easily be applied to our misbehaving feathered children and work very effectively.