Hi Cnoji! Nice to have you join in our forums. I would recommend my more basiic workouts first so that it is easier for you to catch on to the moves.
I don't have anything that totals just 30 minutes but you can just do as much or as little of these workouts that you have time for. Also, each of the workouts have premixes so you can find a premix that may have a shorter option.
My suggestions are the following DVD's:
Low Impact Step (complete with a step workout, a sculpting workout, and premixes combining both workouts)
Basic Step and Body Fusion all one one DVD. Basic step is a solid and easy to learn step aerobic routine. Body Fusion is a 50 minute combination of step aerobics and hand weights. An as always, there are premixes with these workouts that will provide numerous other workout options (some shorter, some longer, some harder, some just different).
Cardio and Weights DVD....There are two workouts on this DVD however, for now I would only recommend doing cardio and weights and then save Imax 2 for down the road when you have gotten much more familiar with my style. Pop it in while folding laundry for some entertainment for now ;-)
You might also want to try the Cross Train Express series all on one DVD. These workouts are a bunch of short cardio workouts (averaging 30 to 35 minutes) with focus on one muscle group after the cardio. The thought process is to use them for the whole week so that by the end of the week you have worked every body part. This series is more advanced than those listed above though.
Good luck!