Hi Cricket (@bikequeen): For generic wood, I usually use some tan or light brown acrylic for the base layer, and then use some dark brown artist oils. After the tan is dry, paint the pattern you want using the oils. Let the oils dry for 20-30 minutes and use thinner to lightly blend the pattern. Be sure to use acrylic for the base layer, or it will react with the thinner for the oils.
I have never been good creating flesh colors. Vallejo, along with several other manufacturers, make several flesh colors that you might use.
Cheers