I have 12 acres, all wooded currently. Home build will be complete around aug, and i want some animals. Thinking about a couple goats and/or sheep, chickens, cow.

How big of a pasture would i need to clear and plant to keep it from becoming pure dirt? I want to keep as much wooded as possible, so was thinking about clearing 4 acres and maybe dividing it in half to be able to rotate, but didn't how many animals that could support without decimating whatever is planted.