These are things all self employed learn some the easy way many the hard way.
You have no friends in business only customers suppliers and potentials and none of them will do you a favour.
Be hardnosed, a soft touch will send you broke in a heartbeat.
Pour as much financial and work capital back into it as you possibly can without going into debt for the first few years, this will pay dividends in the long term.
GET A MENTOR

Seems negative but most small businesses go belly up when people go into the with dreams and no business acumen.