Once you have recruited troops, there are a few things you need to keep in mind.
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Below are some examples of the best troop types that you can recruit grouped by the faction they represent, and you can use the Encyclopedia (press the N key from the map and look at the troops pages) to learn how to upgrade them.
Once you've recruited a soldier, you can use them in battle to gain experience, which can then enable them to upgrade to better troop types. Regular troop types seem to be more favoured as the game progresses than any of the bandit classes, so consider raising troops from their respective factions rather than using a bandit force. You'll need to either buy recruits from settlements for a small amount of gold, or convert prisoners into troops after capturing them.
Keeping their loyalty, feeding them, and upgrading them to stronger troop types will be the key to conquering the land. Mount And Blade 2 Bannerlord has you commanding large armies in epic battles But first you're going to have to win them over.