What are your recommended methods for driving traffic, sign ups and sales for my website?
For maximum results with minimum investment.
Your question far too broad to respond constructively Kari. It all depends what you have on your website and who it is for. There are differing techniques for generating traffic, sign-ups and converting sales. Possibly thousands of variations in all three categories.
What is your objective, and quantify the minimum you identify as your nvestment.