Here's some info that might be helpful.
1. It's no longer called the "Clearinghouse" -- it's now the "Eligibility Center".
2. Here's a link that will answer most all your questions. Clicking on the "General Information" link at the bottom would be the place to start.. And within that part, check out the FAQ section
https://web1.ncaa.org/eligibilitycenter/common/3. The fee is $50.
Hope that helps.