i dont think there are a easy way (whell not fast) to make tc without buying them. the people that have HUGE amount of tc is usually in nabi or something who can get themselves as much as they want.
you can sell stuff in the market, buy low and sell high. or if you are good at art you can enter in art competitions. practise your toribash skills, and then you can enter in game competitions too. you can make avatars and textures and sell them. but the easiest way, as always, is buying.
welcome to toribash! enjoy jour stay!