Planning for the future

I am 23 now and finishing up a Bachelors degree. I'm trying to plan for the next five years, mentally and financially, and I know that if like to have a baby in that time. I'm currently single and I do not plan on starting or maintaining a relationship in the near future, and that has not affected my plans. I always imagined having kids by myself, and I'm perfectly fine with that. Excited, actually! Can anyone help me out with what to expect? How do you decide on an OB? How do you decide where to get your donor sperm? What are the benefits of insemination at a doctor's office as opposed to at home? What are the costs associated with these things? I would really appreciate any insight anyone can give me!