What is your budget? If you have the cash then I would recommend the 17-55 2.8 IS and 70-200 2.8. Those lenses are expensive but will be all the glass you need for your weddings, and most anything else you tackle for now . Get yourself good flash (580EX) and like mentioned, it's a good idea to have a second body, spare cards and batteries.
If your on a budget then there are some good 3rd party lenses in those focal lengths to consider as well. From personal experience I recommend the Tamron 17-50 2.8 and the Sigma 70-200 2.8 ( Although finding a trouble free copy of the Siggy can be challenging, if you find one it's a GREAT lens) The Tamron 70-200 2.8 is a nice lens as well (Very sharp, great colors) but the AF is inferior to Canon and Sigma. The Tamron would work fine for anything other than fast action sports. Another good lens for the money is the Sigma 18-50 f2.8 Macro, which can be bought used around $300 bucks. It's probably important to note that all the wide zooms I mention are for EF-S mount (1.6 crop) bodies only, like your Rebel, or the XXD series bodies.
The hardest part will be getting familiar with your equiptment and making the proper adjustments quickly and accurately while the wedding is underway. Take the next 8 mos. learning how to adjust your camera for any situation, and especially learn how to operate that flash.
For your photography at home I recommend a decent tripod, and you can buy backgrounds with stands on E-Bay fairly cheap, or just make your own (Just do a Google search on "Homemade studio backdrop" ) with Muslin material and PVC, I make my own muslin backgrounds with white muslin and RIT dye solution. You will need lighting and I strongly recommend avoiding those cheap E-Bay lighting kits that they sell for like $200 bucks...they are crap (Trust me, I have a set collecting dust in my basement).
Alien bees offers quality starter kits for not much more,that you will LOVE. Honestly, the best thing I can recommend is READ, READ, READ. Learn as much as you can about what you want to do, and never be afraid to try.
Good luck
