I can't speak to the starter kit, but here are some links that describe the Momentum program. In short, you get a set number of points, and 35 Flex a week. You try to focus on "filling foods" (previously known as the Core foods) but account for everything.
How many weight watchers points do I get daily?
What are set points?
As for exactly WHAT you get in the starter kit, well, I'm just not sure. You might want a points calculator, an exercise calculator, and some weekly trackers...
OH, and check out the WW at Home thread on this site. These guys are doing what you are doing so they will be a great resource.
Hope this helps!