We still have stumps, sticks and uneven ground in our little 4 acres, but we have grass started. We put up a cross fence to keep the horses off of it for now until it gets established.
On the 10 acres, you need to determine how many acres you will actually have dedicated to pasture. Then divide that into 3 or 4 pastures. The life of a pasture is rotating the stock OFF of it so it can rest and regrow. Stock loves the tender new shoots of grass and will literally eat it down to the roots, ultimately killing the good grass and you are left with a bunch of weeds. You might want to look into growing mangel beets to supplement the feed for winter.
Here in southeast Texas we sow rye grass in the fall for winter pasture. I don't know where you are located-do you have snow all winter, can you plant winter grass such as winter wheat or rye grass?