Welcome and good on you to have rescued the little ones
I can't really add to the great info you have already gotten, other than telling the story of my Berty.
I got him a year ago, from a co-worker that moved, and he was very scared and nervous of my hands, he must have been having a bad experience in his previous home, but with a lot of patience and no forcing the issue, he is now at least not afraid of my hands anymore, but still not like my other birds, who will happily step up in the cage, he will only do that if there is treats involved, that is perfectly fine with me.
But depending on the personalities of your birds, they may surprise you and get to be your flock mates on almost equal terms.
Just remember patience is key.
So as long as you don't expect wonders, you can only get positive experiences
Sorry for rambling on, but to conclude, new toys etc. is now no big deal for Berty, he will now just look at me and step aside when I need to do something in the cage, not flee like he used to
I wish you the best of luck and hope you keep us updated