I do both. I was fortunate enough to grow up with a family who raced and I shared the same marine / automotive interest as my family and close friends. My suggestion is to not go to the CC to learn about performance engines. Although the general automitive information you will get will be usefull, it will not fufill your goal. If possible, I would try to find someone, maybe on here that is willing to mentor you and help you if you are really wanting to be able to do engine, pump rebuilds, etc. I don't expect you to be able to rebuild an engine or pump via the forums, but we should be able to help you do a basic service right here.

Tackle them 1 at a time and ask lots of questions, even if you think they are dumb.