Welcome Justin
I have just joined up as well. Some of your answers can be read on my posting. I had/have a lot of the same questions.
But the thing to do FIRST!!! is get a copies of the "Illustrated Parts Catalog" and the "Operating Instructions and Workshop Manual". These really do answer a lot of your questions.
If you go through the for sale forum you will get a lot of supplier info as well.
And of course the internet search engines will be a big help. But there seems to be alot of helpfull and very knowledgable folks here on this web site who I heartily recommend.
Good luck and again welcome
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