The Next Level: A Prep's Guide to College Recruiting by Joe Hornback
I highly recommend this paperback book for college recruiting (not just D-I). It contains some awesome information on what the athlete, as well as parents, should expect in the recruiting process. I got mine through Amazon.com for about $10. It gives the same advice as TIPSY did, plus more. I got this book when my son started receiving letters and attention - we did not want to be ignorant on the ins and outs of the recruiting process.
Mr. Hornback also does not favor recruiting companies - save yourself the money, and do it yourself. We did it, not knowing much of anything about football & making highlight tapes, and it still was effective. The college coaches know what they are looking at, and if they see even a glimmer of talent, they'll be contacting you. DEFINITELY fill out the questionnaires, found on most college websites. Sometimes the questionnaires are the only thing that alerts a coach to the possible talent. The coaches will usually then contact the high school coach, and start the process from there. The college coaches don't all have time to find you - you need to find them!
The recruiting process can be an enjoyable process, but can also be an absolute CIRCUS - enough that it becomes a distraction for the athlete. (Been there, done that, and glad it's over!)