Well... I mean, I could give you more templates to work from, but it really wouldn't be too different from Charas project rpg sprite bodies that they have on there. I guess the way to make a sprite sheet is just to think about it all before you make it, or take something to work from. The zombie sprite sheet I made I actually just had a sprite of an adventure guy jumping so I changed the size and changed it into a zombie then two more that faced up and down instead of left (the original sprite was facing left).
That's the easiest way, just work from an example, as you're trying to do here, but to work from scratch you'd need to know where to generally change each pixel before you start and it's a bit complicated, but gets easier because you can go back and change it. Hmm :P Idk if I can help much there, but I can give you another template if you'd like?
I'd just advise you to think of it more like you're making something in Minecraft. I'm sure I'm not the only person who thinks of it that way. I just plan the whole thing out before I even start and then I build it, block by block.