Originally Posted by
Blackthorne
As to how many troops you need, this varies alot due to things like your econmomy, how far along the campaign you are and also how good you are at fighting battles. In general make sure that you are always making a profit and you wont go far wrong. At the start of the game you wont be able to support many samurai troops so I suggest building mostly Ashigaru since they're nice and cheap and losses can be replenished anywhere.
That should get you started, good luck.