Andrea has a decent beginner video that covers the very basics and a free download here with much of the same info.
Vallejo Acrylics has anopther tutorial under "model Color."
The best way to improve your figure painting is to find a mentor. You don't say where you are, so it's hard to help there. Clubs are gerat for finding mentors. Are there any figure shows near you? There are several big ones acrss he US and several more in Europe. Networking at these events an help. PM me with your location and I may be able to make some suggestions for events and clubs.
The next best thing is to frequent some of the more figure oriented sites:
Historicus Forma, part of Armorame.
Time Lines
Planet Figure
And Alan and Marion Ball's website. He sculpts for himself ands numerous figure companies and she paints. They are a couple really nice people, too.