Once you've got the Amiga up and running, you'll find the
Amiga University website is full of links to FAQs, how-tos, guides and other useful hints and tips.
If you ever feel like expanding your Amiga, but are confused by all the things on offer on
eBay, or
Amibench, then you can look things up at
The Big Book of Amiga Hardware.
If you're ever stuck, you've already found a great place to ask; Amiga.org has a lot of very knowledgable folks who'll be pleased to help.
Have fun with your Amiga! :-D
