These can be a helpful way to simplify the process. Most services have free tiers that will at least allow you to have a profile page with helpful information like grades, career interest, contact info, and video. Usually the services make money by doing some of the work for you – they contact coaches for you, they use their proprietary algorithms to match you up with schools, they track who visits your page for you. None of that is really necessary, but can make your life easier.
Here are a couple examples, take a look and shop around:
Other Helpful Links:
This Blog is a very helpful guide to the process aimed at players and parents:
This is the NCAA Guide for the College Bound Student Athlete, which you can download as a pdf for free: