You need to capture every settlement of a specific region (for example: Sarsfield, Golden Tooth and Oxcross) to be able to start recruiting. You can check which settlement belongs to which region by right-clicking the House Sigil "building".
Otherwise you can only recruit (native troops to your faction) if you build regional garrisons; it's very time consuming and very expensive, and initially it's only basic spearmen.
Generally you'll be better off manually moving your troops from your innermost settlements toward the frontlines rather than recruiting locally, because you'll run out of men long before the enemy does.
chocolatepotato
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