Welcome to the happy & addictive world of Cathe! I'm assuming by your post you are least a moderate exerciser. Do you like step? Also, it would be good to know how you are with choreography. Lastly, it is helpful to know if you do any weight training and what your basic workout schedule includes.
Aside from those questions, Step Blast is an absolute favorite here on the boards that people like the premix of as well with Step, Jump, & Pump. Some other tried and true great ones include Kick, Punch, & Crunch, and Imax 2 (kick butt interval work). For weight work, it depends on if you want endurance, muscle gain, or a bit of both. For endurance, Power Hour, Muscle Endurance, and Musclemax are the ones to go for. For gains, I've heard a lot of great votes for slow & heavy series.
Barbells, steps, etc can generally be purchased from stores like Walmart for fairly decent prices. Those are some initial recommendations that I can think of off the top of my head. Good luck getting started!
"you miss 100% of the shots you never take"
Debbie