Planning to Adopt... What do I need to know?

I'm planning to adopt a child at least 5 years down the road. That'll put me in my mid-to-late twenties. I've read plenty of blog articles on what to expect during the process itself, but I'd like to know what I need to start thinking about right now. Basically, I'd like it if current adoptive parents would do if they had this time to prep for the adoption of their first child. Little background on me: I'm a single woman who is planning to stay single unless I "magically" find "the One". (I highly doubt that'll happen, but you can't predict life.) I have a strong support system in my hometown consisting of immediate and extended family as well as my church. I'll probably return there once the time comes. I'm not expecting to be incredibly wealthy at that point, but I know I won't adopt if it's not financially feasible. I'm planning to foster-to-adopt. I don't care about the child's race or gender.