Great job I love the modles, did you use Blenders in house sculpting?
There are many ways to texture in blender; however, depending on your aplication of these modles can vary greatly If you intend to use it as a single render scene or a move, the best method is a multi material node set in texture paint mode. It can be a bit of a pain to set up but works nicely in the end.
If you intend for the to be game modles i am afraid the poly cout is way too high, no fret though you can keep the detail and lower the poly count quite siple. All you have to do is ad a new object prefferably a plane go to edit mode extract the necessary vertices edges and such to form the general shape of the original modle. This process can be halved literally by using the mirror modifire. After all that is complete take the new object and creat UV seams these are areas where the flattened UV form of the mesh are cut to relive stress. It is best to separate whole sections of objects like the front back and sleeve of a shirt would be three flattened meshes in the UV editor. After you mark these seams (ctrl+e) hit U to unwrap UV. You then and shape up the uv's in the editor, it is best to make the sections individual rectangles. The use the uv dop down at the bottom of that edit window and select extract UV layout ot is best to make this around 256x256 for the average face. Then select your favorite image manipulator that opens PNG and add the colors.
To keep the detail of your high poly model apply the mirror modifier then put both models in the same 3d space select the high poly then low poly then select bake normal map. You will then apply this the same as any texture in the materials editor except you will chect the normals box and uncheck the color box.
If you need any help with textures just PM me also if there are a lot of spelling mistakes and what not pleas forgive me of my trying to use a phone to type all this. Haha