to get lean i always use the tried and true high protein/low-moderate carbs method- most carbs early in the day (oatmeal and whey in the morning after a fasted cardio session is good)- eat alot of tuna and chicken breast and dark greens.
the cardio is obviously important, but the weight training is extremely important too. you need to build that muscle, because your muscles are the furnace to burn that stubborn fat and calories.
i'm preaching a bit and you might already know this, but hey... here it is.
and for supps- i recommend the basics 1st- mulitvit, whey protein, , ... and maybe some joint formula or cissus for us older dudes...