When I joined the gym at first I got programme for fat burning and increasing fitness from the personal trainer, it might give you an idea?
10 min on the bike, 15 min on the treadmill (5km per hour, increasing gradient as I go along)
then weights at 2 sets of 15 reps each, I am weedy so I use the lowest setting for the arm exercises:
arm curl (front and back)
leg curl (front and back)
The thingy which makes your stomach flat (forget what it's called - cradle?)
100 calorie burn on x-trainer (elliptical in the US, I think?) Takes abiout 11 min.
another 5 min on the bike at a low sett to cool down
then I go to the pub, ha!
Er, you might want to miss the last step out