Being a newbie myself, I would say that the best advice is to PRACTICE RESTRAINT!
As enticing as it is to throw some dollars away for PPC
and every affiliate tool out there, it's not going to pay off until you know what you're doing. Manage your budgets TIGHTLY and do very small-scale experiments as you get the hang of each piece of the puzzle.
The more I learn the more I realize I'm lacking additional pieces of the marketing equation that I need to address before I can create an operating profit.
It's hard, though, not to jump right in and blow a bunch of money.