Hi there, we've been raising goats a few years on rotational areas. Highly recommend you get your fences set up before goats.
You probably already considered this.
There is much to consider with goats, as others have mentioned mineral and nutritional needs. We rotate our goats weekly. It's pasture plus some woodsy-forage.
They have access to a barn, with mineral feeders, one side has Himalayan salt and the other has a mineral called sweet lix. Goats have mineral needs. Especially keeping the calcium/copper ratio right.
Rain water is better for goats than well water. Well water is high in minerals that can effect their calcium/copper ratios. It's common to see a coat lighten in color of black/red goats if this ratio is wrong. Plus their tail will look thin.
if you want goats for land cleaning, rotate through smaller areas more often. If you are seeking milk production grain/hay are likley needed. You will be amazed how quickly goats can clear an area. I think it's like 3-4 goats to clear an acre per week.
I only give gran to our milking doe. The goats get a flake or two of hay each eve. Rotating has helped reduce feed costs but not eliminated it.
best of luck. goats are amazing