That's not very courageous of you. You're a poor excuse for a Viking! Jarlshof is a farming community and no place for a military power base. It is also a long way from the enemy shores. It would be difficult to carry out surprise raids from there.
Join the Earls Arnkel and Erlend on Orkney. It is well-placed for raiding down the western coasts as well as the southern shores.
Attack directly into the heart of Alba. Once you've conquered a piece of land as your headquarters, you can gradually build up power and think about infiltrating the rest of the kingdom.
Which card will you play?