Congratulations! If you haven't already, consider placing an order for ammo for your new M1. CMP still has M2 Ball for around $75 per can, and it comes on Enbloc clips. Get it while you can.
Oh, and while you're waiting, go ahead and send in your order for at least one carbine, one 1903 or A3, one Mossberg US M44, and anything else that devious little candy store has to offer.
I got two HRA M1's from CMP this winter, and they are beauties. I hope you get a great-looking shooter.
One thing that was very helpful for me was Walt Kuleck's book "The M1 Garand Complete Assembly Guide". If you're new to the M1, or even if you're not, it's a great companion to your new rifle. I still refer to it when disassembling trigger assemblies or bolts.
http://www.midwayusa.com/viewProduct/?productNumber=111655
Only other thing I might suggest is deciding what you want your Garand to be/do. Service grade should come with pretty decent metal, but the wood could need some work. Lots of folks choose to leave the wood original; others strip and refinish it. If you choose the latter, there are lots of good on-line articles detailing different methods of refinishing.
Whatever you choose, be prepared to remove a lot of cosmoline from the entire rifle, and give it a good tear-down, cleaning, and re-lubing before shooting.
Have fun!