I got married for about $1000 in my parents' back yard so I don't know much about weddings. I do know to hire a deejay that's done a million weddings and insist on that to the deejay company. You want one who knows how to get your crowd dancing and having fun. And don't let your friend take pictures just because she has a nice camera. Hire a pro.
Other than that, I'm no help at all!
Here's some great tips from Walletjoy.com to help you out!