The guidelines for using animal manures in the garden, where food crops are grown, is that the manure should not be applied sooner than 90 days of harvest for above ground crops, ie, lettuce, tomatoes, peppers, squashes, melons, or 120 days before harvest for root crops, ie. beets. carrots, parsnips, turnips.

How much to apply depends on what your soil needs. if you soil needs 50 pounds of manure per 1,000 square feet it does little to apply 50 pounds per 100 square feet except create problems for plant growth.
Sheep manure is considered a cool manure so tilling it in and waiting 30 days to plant should be adequate.