Adopting a 10yr old?!?!

Ok moms I seriously need y’all help. My husband and I have been TTC our first child together for quite a while now without success. We’ve just been working on us and doing the best we can so we are pretty stable. This little boy from church is being put up into state custody and we got asked to be is guardian so we agreed but I am stressing out! Financially we are ready, we have a decent home, steady marriage and we know children are something we want and we know we want him but it’s scary going from no children to a 10 year old boy who has been through a lot. I need every ounce of advice I can get from parents especially ones who are raising young boys. Please and thank you!