Roughing in the shapes

So currently I am now using mudbox just to sketch in the basic over all shapes of the muscles. I'll later go back and smooth in and add in more detail. I don't plan on painting it. I just wanna know where the muscles go for both male and female. Later on I plan on doing a blood elf chick but I don't know what I want her to be like. A mage? Villager? Warrior? For now I just want to focus on anatomy first.