First, don't panic! You have taken on quite a responsibility, but you can do it. Refer to the resources posted above. PTO Today is a great resource.
The first thing you should focus on is recruiting your board. Before you even think about fundraising or anything else, you need a solid group of volunteers who can work together. No need to rush into fundraising or putting on a big event. It may take a while, but you need the traction of a good group of volunteers.
Getting people involved can be difficult. Tap people you know, but also make sure you reach out to the whole community of parents. If you don't have a contact list (including emails), start building one right away.
You may want to think about starting with a survey, as I explain on this
blog post
.
Good luck! You'll be great!!