I completely agree with the above. If you can borrow something then go for it but don't put any money into this venture (that means no reflectors!). Also, a wedding is not a place to try out new gear/new techniques. Only do what you are proficient with.
I think I got paid like $250 for my 1st wedding so $400 isn't too bad :-) Don't worry about packages. At $400 there's really no room. Give them a disc of JEPGS (processed of course) and let them know that they can have professionaly made prints off of your website. My general rule of thumb is:
1 hour behind the camera = 2 hours behind the computer. HDNitehawk is right, if you look closely you'll find out that you are making minimum wage :-( Oh well, next time you can charge $1k :-)