Okay - it depends how you want to classify "Beginner"
If You NEVER really excerised - or just have been excerising for a while.
I reccomend any of the Transfirmation series. ie:
Total Body Time Crunch (Rebekah Sturkie)
Core Solutions (Alison Davis)
Ultimate Fat Burner (Alison Davis)
Tight Buns, Killer Legs(Kelsie Daniels)
Tina Smalley's Fat BUrning Workouts (Either with the Cords or the Ball)
and the cardio-weights system (that includes 4 dvds).
If you are a beginner but want a challenge (and don't mind dated stuff). I STRONGLY reccomend: Firm Classics 1-3. (they are awesome and they will whip your butt).
Also - if you like step - get anything "Fanny Lifter" or "Transfirmer" invest in that, and it will be good. the Firm is something that you can seriously grow into. you can do any of thse "advanced" stuff, w/o weights or the lightest weights and then just heavy up on it. that's what I did