As for taxes, it depends on your monthly income. There's a
benchmark for it.
If u believe ur products can sell, u could try pasar malam or push
cart as a start as these places usually generates alot of potential
customer.This way you could analyse the market and see how it goes.
Find a partner or two to help you with the rental/expenses. If your
products sell like hotcakes, than you could open a shop. 
