Welcome! Id start by reading some build threads about your boat. I rebuilt my ‘79 160ss and its nearing completion. I forget what year
@SHSU ’s 160ss is, but thats another thread you can reference.
Wiring will be mainly subject to your motor brand, and then whatever other simple electronics you want to add. I taught myself to wire and its not hard. Working on old motors is more of a challenge depending on experience (for me its challenging lol).
Drop some pics of your boat and ask some questions! Guys here are pretty awesome with all the knowledge and time they share.