adopting older kids w/ biological children in the house - questions

I was just thingink of this last night! We were just chosen to be the parents of a 3 1/2 yr-old little boy and our bio girls are 6 and 10, so we have pictures of them everywhere! I was shocked to recieve the start of a Life Book for our little guy this week. It has baby pictures and everything in it. OUr plan is too just take a new family picute soon after he is settled in and start making memories with him to fill the house with! =0)