Hi Daffas ,
Increase the polycount progressively.
Starting with some LowPoly tut will show you, as it's the case with the LP Game Character, how achieving human basic flows for a good approach of possible rigging.
Thinking further, LP Character really helps in learning how to deal with poly tools ... the optimized way.
And last but not least, most modeler start with a LP model, and refine it afterwards, as needed according to sketch or "idea". Usually, if your modeling needs detail somewhere, you'll throw cuts. Imagine you want to model veins (not speaking 'bout normal maps, you'll see that later) on some head, you wont need the same resolution for the veins as for cheek or ears << for this particular reason, I think it's better learning from LP, and refine, optimizingly.
Ow, I almost forgot. I strongly advise you this book as you are speaking 'humans and animations' (animation and basic behaviour concept are thoroughly explained). A gold book really, for beginners as for pros.
That's only my pov