Things have been moving along for us and we should be certified Monday

We are very excited!
There is a possibility that we could have our first sibling placement early July, a toddler and a first grader. The eldest has been diagnosed with RAD and ADHD. The youngest seems to 'exhibit normal behaviours'
The kids have been in and out of care a few times and currently both parents are incarcerated. The DSS is requesting TPR. The children are in respite care right now.
We are excited to possibly have our first placement but honestly, somewhat nervous with the issues of the older child as our first placement. He has been known to have tantrums lasting from 45 minutes to 3 hours. He has been 'kicked out' of daycare for biting and tripping. Does anyone have any advice or experience on children diagnosed with RAD and/or ADHD? Or do you have any book suggestions?
Thanks!