I'd get as many guns as I can gain access to, choose an important strategically placed encampment. Preferably in the middle of a barren expanse. There I would build a small fort and offer people refuge from beasts as they sleep. Bound to have many travelers stop by my oasis, I would use this as a strategy to amass a lot of money/resources/men (turning my fort into a small wall-surrounded fortified town).
Eventually, the brotherhood would arrive and I would convince them to make my outpost a brotherhood outpost (making me the director/ a paladin).
Eventually, the brotherhood would arrive and I would convince them to make my outpost a brotherhood outpost (making me the director/ a paladin).