Unless you are adopting an older child, you don’t have to do anything. A lot of people make big, detailed plans, but then they get home, and the child is going to dictate everything anyway.
Most issues that you need to know will be addressed by the adoption agency. here are some of the more important points:
Chinese children generally bond very well with their adoptive parents, and that bonding will take place in the week and a half or so you are in China. You will have to deal with the jet lag; the child will be wide awake in the middle of the night for a few weeks or so, and you will have to work your schedule around that.
Chinese children, in general, do not drink milk and are lactose intolerant. Some orphanages are reputedly giving milk to children just to get them used to it; but I don’t know if that is true or not. In general, give the child soy milk as it can give the child major gas, and possibly cause them to projective vomit (firsthand experience on that one…lol). Same with their diet. Try to very gradually introduce the child to the western diet. Your Chinese guide will likely be able to help you with that.
Lastly, when you get home, you should bring your child to a doctor to get checked out, preferably by a doctor that deals with foreign adopted children, or at least Chinese children. They will check for things that western doctors are not familiar with.