Welcome to the Monkey house! I also have a '77 and found that the 1976 Factory Service Manual is the same for the 1977.
Here's a link to it, you may want to bookmark it!
Also, get ready to become a liar!
Unless you can find a parts shop with a crusty old curmudgeon for a counter man who knows his stuff, you will find that as you learn more about your Jeep, you'll have to lie when the kid behind the counter tries to enter info into his computer. You may have to tell him you own a '76 Camaro for a steering column part or a Ford for a starter or distributor part. It's okay though, because the kid will eventually come to the conclusion that you're a "car god" with all kinds of cool vehicles!
Have fun with your Jeep!