Thanks for the congrats...it's all pretty exciting but stressful too.
You can have your event outside. We are having the ceremony at the park view terrace and the reception inside at one of the convention room. They also have a wedding garden and brisa courtyard for outdoor. I think the terrace and courtyard could also be used for the reception. I'm using Sidney's florist but you can bring in your own floral. You are responsible for the set up and take down of anything you bring in.
I tried to sign up for the disney bride Facebook page awhile ago. I got the PM from someone and responded but nothing ever happened so I gave up on that.
Let me know if you have more questions.