I'm going to the gym 3 times a week (Mon, Wed, Fri) with the occasional extra day depending on work.
My goal is to lose some weight, not much, about 5-7 kgs (13 pounds?) and build some muscle.
I do 20-30 minutes of cardio, then weights, then finish with another 20 -30 of cardio.
Cardio is usually bike and/or treadles I think they are called. (Like a treadmill but with two 'planks' for each leg that move up and down as you step)
I believe with weights that the best way is to use heavy weight with low reps. Currently I'm doing 4 sets of 10, 9, 8 & 7, every main muscle like arms, chest, shoulders, legs, etc.
So, is this ok? Is a day inbetween sufficient time for the muscles to rest/rebuild? Is the cardio too much/little?

Thanks heaps.