Welcome.
Suggest you purchase and watch TOP DVDs numbers 3 & 4 ASAP; they'll give you some good general knowledge of pinball basics for your type of machine and what tools to buy:
You can always ask for help here--the vids will just get you up to speed in a hurry (so you'll be able to understand the play called in from the sidelines).
Too expensive not to learn pin repair...huge waste of money that could be spent on something sensible like more games.