Long term, you'll get the best results (I'm assuming right handed)...

Right hand on the mouse.
This controls mouse-look and movement.

Left hand on the keyboard.
Use these keybinds with or without mod keys:
12345, QWERT, ASDFG, ZXCVB.
That's 20 keys, you should also be able to reach:
Left Alt (Thumb), Left Ctrl (Pinky) and Left Shift (Pinky)
Which gets you a ton more keys.



Take it with a grain of salt however.
I don't use all of these keybinds myself.
But the important ones for PvP, you'd want easily accessible with the left hand alone.