Cheers P-MAN!
As Sapper has already pointed out, you need to build naval ports, to be able to construct fleets. Not all regions are suitable for a naval port, only those with access to quality timber. IIRC, in britain that's only your starting region, with the town Camulosadade and the southern region in Ireland.
For the troops in Caldeonia: The caledonian skirmishers are factional units for the Casse, therefore you need to recruit them from factional barracks, not regional ones. In fact, on the birish isles, only irish towns will have regional units for you, all units on the british mainland are factional for the Casse (which is actually good for you)
EDIT: Btw, I highly recommend building at least one of the irish towns up as a lvl 4 gvt with regional barracks at level 4 (I think that's sufficient) to get irish nobles.
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