See the link at the bottom for good info...
Weddings are tough photo assignments if done properly, are you sure you are ready? There is no room for error and if something happens - no way to reshoot it.
Planning
Visiting church
Going to rehearsal - shoot that for practice
Backup gear
Have an assistant
Plan the group shots
Wear deodorant - you will need it
Most pros charge hundreds if not thousands of dollars for prime wedding photography - because it is tough work and is supposed to last a lifetime.
Wedding assignments are expected to deliver traditional wedding images, complete with posed group shots - and very little of it is simple snapshots.
It is great that you are making such great business plans - just make sure you can deliver quality results.
Good luck - see linked page for more info
http://www.christophermaxwell.com/wedding-photography-tips.htm