Hi, I am not too sure what your skills are, you could be expert ninja in Native mode, but a few basic tips I would give to start off in the mod are.
Be prepared to alter skill levels for you and your army in the early game. Some of the groups that attack you are very strong and you could be disheartened trying to fight them.
Keep your band small to start with so you can move faster to avoid impossible conflicts, and build them up.
The troops you mentioned are expensive, and you are unlikley to be able to afford them in the early game, so unless you beat a gang of bandits etc. and take their prisoners on, higher tier troops will be hard to come by.
This is a tough mod to play, but really rewarding, in fact I actually like the early and middle game the most, so take your time as it will get really fast paced later on and explore, a major part of the fun.
A last point, try not to fall out with too many "Knight" groups that you may see around, as eventually it can effect your game later on.