Some tips (I played the base version).
The mod has a few specifics which make standard Warband tactics obsolete.
1: there are no shields. This means bowmen and musketeers rule the battlefield
2: cavalry is not cost effective. You _can_ make a cavalry charge work if you want though (the Takeda AI faction sometimes does this). In general I usually go with 20% pikeman (non samurai, the cheap guys). The rest is an equal split between bows and muskets.
3: there are more companions than in vanilla, they are better quality, and it is easier to train them up (again, no shields on enemies, so companions can be death machines with better bows). They usually stay on foot.
4: I found the northest part of the map easier to start in. The bandits in the region have good-ish loot, and give good XP.
5: I would advise winning a few tournements, saving up some money, getting some companions, and avoiding recruitment for some time. Until about eveyone is level 10.
6: while the troops are mostly footmen, you (and maybe some select companions) should be horse archers. Simply do some shooting from the flank of the enemy, or get behind their back. You are not really in for the killing (but if you have a high level character, why not?), you are trying to interrupt the AI when they are reloading muskets, which gives your muskets some free shots on the long run.
7: never go into melee with a katana. Really, you will get murdered by polearms. If you want to go to melee, use the longer reach swords (tachi I think?), of even better, use polearms yourself.
8: as always, equip your companions with weapons which don't have a thrust attack, only swings. Martial characters get a bow, supports get a musket (teppo?). Best armor possible. I found that the european breastplates have very good weight/armor ratio.