I am looking to buy a good starter DSLR, I was looking at the Canon EOS Rebel t1i kit, the 50mm f/1.8, and a telephoto lens. Is this a good choice?
For a starter kit to learn with the t1i will probably suffice to learn how to shoot. I would recommend a zoom lens before the 50mm as having a lens that can do wide as well as normal shots will be more useful. Something in a range of 17-55 f/2.8 for a crop sensor camera. The 50mm is a good add on, but go for the f/1.4 instead as it's built better and has a USM focus motor which will focus faster. A good tele could be added later.
You're a long ways away from going "pro" and rather than buy a "pro" grade camera at this point you would be better off putting money towards good glass and other essentials. Later when you're ready to shoot for real money will be the time to upgrade to the latest and greatest technology. At that time the t1i will have worn out from all the practicing you'll have done or if it still works you can use it as a backup camera which will be necessary to have - "Oh!! Can we pause the ceremony while I get my camera working"
So far as other essentials, a shoe mount flash should be top on your list, one that has a head that can tilt and swivel to allow bouncing of the light. The 430EX II will work for now and can serve as a backup flash later when you upgrade to a 580EX II or whatever Canon's latest might be. Apart from learning to use the camera proficiently, learning to use the flash effectively will be the second largest challenge that you'll have. Flash bracket optional depending on your preference.
Basic kit I had brought to weddings....(when I first started I used a 300D Rebel as backup to the 30D with a slightly different lens lineup. Actually started with film years ago with a 35mm and MF, but that's a different story from digital)
Canon 30D, 40D, 5D with extra batteries
Tamron 17-50 f/2.8
Canon 24-70L f/2.8
Canon 70-200l f/2.8 IS
Canon 50 f/1.4 & 85 f/1.8
Other wide lens
580EX, 580EX II, 430EX with more batteries than I would need for an event
If you add it all up, you can see that having good gear won't be cheap, but if you're going to do it right you don't want cheap. And don't forget insurance for all that gear.