The Natural Fibre Co will spin your fleeces into various gauges of yarn, depending on the breed. You need 20-25kgs of fleece for a run. They will then forward them to a weaver who will make wonderful blankets and throws. The profit from selling the blankets won't make you rich, although it's worth doing (great Christmas presents too), but offered for sale with other Jacob products such as yarn, tanned skins, horn buttons etc you will have an interesting range on offer. Check out some of the Jacob shows and get togethers where there are craft stalls for ideas. Also look at the US sites, where they are very imaginative with their products (and go for slightly different breed standards)
With Jacob wool, because you get three colours - white, chocolate and grey (the two mixed) then you need the 20-25 kgs of each colour, unless you just want grey yarn.
You can phone the very friendly staff at the NFCo for advice.