I agree with Tom about fast lenses, which are always a requirement for indoor weddings. 2 hours, is actually a lot of time, as a lot of churches will give you 15 minutes or so afterwards for formals (especially if there is another wedding afterwards).
Equipment suggestions might be easier if we knew more about your situation. Do you know how to use flashes (either on camera or off)? Do you have the funds to rent equipment if you don't own it? What kind of lenses do you own/have access to? How many people are in the bridal party? Do you have someone you can take with you as an assistant to hold off camera flashes or reflectors or things like that (granted you'd only need a reflector if you decide to do outdoor shots)? Are you shooting just some individual shots, couple shots and formals? Do you know anything about posing people?
When you start looking at these specifics, there are lots of suggestions about all of these on the forum. Feel free to let us know exactly what you want to know, but you can also try searching the forum. Lots of information. For instance, there is great advice on portraits
here. I ran across it when looking through this thread:
FAQ for New TPF Members
Lots of info on this forum. Good luck with the wedding.