Any of these products can be used by themselves or in any combinations, though when you first get them, you should familiarize yourself with them, one by one so that you know what each one does and how much you need of each to get the most out of them and so that they will be the most effective for you. This post might help: How To Find Your Sweet Spot (How to find your sweet spot...)
Also, you can post questions in the mens section where there are many very experienced and knowledgeable guys who can give you lots of helpful tips on the best way to combine them for whatever effect you are going for.