Welcome to Spark! There are a lot of tools and resources available here to help us on our journey; my favorites are the fitness and nutrition trackers because the keep me on track and accountable every day. But the best part of Spark is the community, the people here are amazing!
I've been giving some thought to Jillian's Body Revolution also but I love having lots of choices for my exercise; I get bored doing the same thing every day. What is important is that you are exercising, so find what you enjoy and go for it. If Jillian motivates you then her dvd's would be a good match.
Keep your goals in focus, put in the work and you will succeed!