Yes, there are a few different sample letters. Go to the "Recruiting Tips" section and click on the part which says for players, parents and coaches. They are in there.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .