What are you planning? A Disney vacation? We need to know when you want to travel, how many in your group and their ages, whether you're driving or flying, and how much you want to spend.
If you go to the Mousesavers website there is a section there on "Getting Started." It pretty much lays out all the decisions you need to make. Once you start getting an idea of when and where is going to work best for you, then you can start looking for ways to make it cheaper.
I assume you mean a WDW vacation. When are you going? Who is going-- how many and what are the kids' ages? What sort of a budget are we talking about? Do you know where you're staying? If not, on site or off?
Are you interested in the Dining Plan?
What are your primary concerns?
We'll have a much easier time helping you with some basic info.