Re: lose bodyfat w/o lifting heavy?
You definately do not have to lift heavy in order to lose bodyfat. You are right that basically all you really need to work on is your diet, cardio, and some resistance training in order to lose fat and see great results. Basically, cleaning up your diet allows you to fuel your body while limiting the excess calories that gets stored as fat. The cardio helps get rid of the fat that you already have (along with many other cardiovascular benefits). Lastly, the restistance training helps tighten and tone your body by strengthening and conditioning your muscles. The more muscle you have the more calories you burn and the higher your metabolism becomes making dieting/wieghtloss easier. Resistance bands, free weights, and your own body wieght is all you need for now. You can't and don't want to go heavy before you are conditioned to do so, otherwise you increase the risk of hurting yourself. Basically, when you find you have reached a plateau and are looking to add some mass, then heavier lifting becomes a necessity.
Hope this helps, and gluck and congrats on getting started.