Looking through your portfolio on your site, it seems like you're off to a good start. I like some of the compositions, but some I don't. That's all personal preference though.
However, from the looks of it, all of your photos are taken with natural light. That $%^% won't fly for weddings. Not gonna work. You need to be a freaking ninja with photographic lighting to properly record a wedding. It's very hard to consistantly make good looking photos with on or off camera flash in a rapidly changing enviroment like a wedding.
You also have some focus issues... lots of distracting DOF's with things/people OOF in the foreground, and lots of photos that are very soft, or out of focus. For weddings, photos need to be consistantly sharp and in perfect focus, as any of them could be ordered in a large size that will make soft/OOF photos look like total garbage.
I'm not saying you can't do it. But I reccomend you hire a second shooter in case you miss things, and that in the mean time, you actively participate in the community. Some people, including (especially) me, come off as arrogant pricks. But That's not the case (well, except for a few people who really are). Even when people just flat out tell you that a photo SUCKS, that's helpful. It tells you what doesn't work. Listen to their advice and grow from it.
To recap, work on the following things before the wedding:
1.) FOCUS, FOCUS, FOCUS. It doesn't matter how good the lighting, composition, or moment are, without good, sharp focus, the photo goes in the garbage and cannot be used. A wedding is not the time to use intentional soft focus, especially not your first wedding.
2.) Lighting. Get a GOOD flash ASAP, and maybe a few cheap-o (yongnuo yn-460 II) manual only flashes, along with some flash triggers. Learn EVERYTHING you can about using flash. How to bounce it. How to use more than one. How to use gels to match the WB of room lights, what different modifiers do, etc. Without this knowledge, you cannot shoot a wedding effectively. Period. (check out strobist.com)
3.) If you don't already have a good computer monitor and calibration tool, get them. You have no way to make prints match what they look like on screen without a good calibrated monitor. This is another must for wedding work.
4.) For the wedding, You're gonna want 2 cameras good in low light (5dII is a good choice). I'd rent 2 of them. Save on changing lenses, and it gives you a backup. As far as lenses, I reccomend renting or buying a 24-70 2.8, and a 70-200 2.8, as well as maybe a wide angle like the tokina 11-16. Well before the wedding, rent at least the camera body you'll be using and familiarize yourself with it.
What are you charging them anyway? Did you factor in that an average wedding shoot takes 10-12 hours? (you'll be DEAD at the end of the night)
How about the additional 12-20 hours youll spend editing the photos and placing orders? Or the cost of renting gear? Fuel to get there and back?
Once you realize how much work a wedding is, and how much gear and knowledge you need to shoot one, you begin to understand why most photographers are charging $2,000-5,000.