I do rotational grazing with my sheep (Shetland and White Dorper) and goats. I have one pasture section that my dad and I fenced with woven wire fence many years ago. The original plan was to subdivide into eight equal sections but right now it's only about three, some of the fences I took down, others are falling down.
For the past few years I have been using Electronet and Electrostop netting from Premier One and am very pleased with it, and am going with that method rather than try to install more woven wire (or repair what's already there.) Paddock size is variable, usually a square/rectangle enclosed by 2-4 rolls of netting (one roll is 160 ft. long).
When I first started with sheep and only had a few, I used a portable pen out of stock panels, 16 feet square, and moved it once or twice a day. Have used it since with small groups. It's a good (and cheap) way to rotationally graze a mini-herd of sheep, and worked great with ewes and lambs. Rams tended to push the panels around and I don't have the energy to pound in T-posts every day to hold the panels in place, also goats tend to learn to move the fence around before too long, so that's why I prefer the electronet.
Paddock size is so variable, you may have one area where the grass is a bit sparser and so the paddock will need to be bigger than in other areas, plus as you improve the soil conditions will change, you will have to learn to be able to tell from the condition of the grass before and after grazing sessions.
