If you're not already doing so, start reading the CMP Forum.
http://forums.thecmp.org/index.php
The people on there are amazingly knowledgeable and very eager to answer your questions. When you first receive it you should completely strip it except for the trigger group. Clean everything and grease (not oil) it in the appropriate spots. I use Mobil 1 Synthetic. This will give you an excellent understanding of the rifle and really shouldn't need to be done more than once a year or so although you can reapply a small amount of grease to the areas more often. I think the CMP website, thecmp.org, and Garand Gear, garandgear.com, have the best instructionals on doing this. There are also a number of good YouTube videos. It's not a complicated rifle but a lot different from anything else you may be used to working on except an M1A if you have one of those. As an aside, the firing pin channel on my CMP Garand was very gritty and didn't allow the firing pin to move freely so I took it apart and found it was full of sand. Interesting to think about where the sand was from, but anyway reassembling the bolt can be difficult so I watched some videos and learned a few tricks that I thought would help. Well, nothing much helped and it took me and a friend who is very experienced about three hours to get it back together. The next day I went online and bought a bolt disassembly/assembly tool whivh is worth it's weight in gold. My advice is that if your firing pin moves freely within the bolt, don't take it apart until you have to or until you have the tool.
If your interest is really piqued, you can get one of the books that will help you identify all of the parts and you can fill out a data sheet on it. Almost all Garands were rebuilt one or more times during and after WWII. Since all of the parts from each manufacturer were required to be interchangeable, what we have are "mixmasters". If your rifle is a 1942 Springfield Armory for example, that only means that the receiver is a '42 SA. The other 70+ parts could be from any or all of the other four or five manufacturers. Most of the parts have serial numbers stamped on them and most of the parts that don't, have identifying characteristics that will allow them to be traced to a specific manufacturer and production date. It's a lot of fun to look these parts up in one of the reference books and write them down. There are data sheets available that you can use for this purpose and a few websites that can also help. Scott Duff is considered by many to be the best authority on the a Garand so his books could be considered to be the last word.
The most important thing is that you get out, shoot it and enjoy it. It's far and away my favorite rifle. There's nothing like the "ping" when the clip ejects after the last round to draw people over at the range. Good luck and have fun.