What tools and supplies do I need to buy to start building furniture and decor out of twigs and sticks?

I have a HUGE slash pile that I want to turn into furniture and usable items. I'm a big fan of rustic / lodge furnishings and decor, and would like to try my hand at making some myself. What kind of tools do you recommend I buy? What other supplies? Until I know whether I can do this, I don't want to invest in expensive power tools or a workbench. Just the basics. I have a hammer and screwdrivers, and that's about it. Ideas?? Also, what tool would I use to scratch designs into the wood?