Welcome my friend !
Good information has already been posted.
If I might add. Pinball News has articles to help you learn in their old section : http://www.pinballnews.com/learn/index.html
And Youtube is littered with short how to videos for learning. How to solder, check continuity, use a meter, etc. etc.
And you can always post on Pinside. Some of the best help available may post to help you with a problem.
LTG : )