My advice would be learn all you can, even before you buy.
First pin, buy local so you can see it. Look it over. Hard to clean areas clean ? if so it's been maintained. Board repairs, looks like they had the right tools and parts or burns, damaged traces, and blobs of flux and solder all over ?
You have a ball rolling around in there hitting stuff. Sooner or later you'll need to fix it or clean it. Find local collectors to give you hands on help, or the name of a reliable repair you can trust - don't get in their way but try and watch and ask a few questions to help you learn.
Pinside has lots of good help. Pinballnews.com in the old section has how to learn articles, Pinwiki is a good resource. And Youtube for short how to videos on how to solder, use a meter, etc.etc.
Welcome my friend to the wonderful world of pinball !
LTG : )