Generally, its best to begin with a plan rather than jump in on a tactic. Having a plan is important – even if you are trying to figure out how much to spend on marketing budget or you have a budget and are trying to figure out where to spend it.
Start with the goal. What do you want to accomplish? I know, I know, you want more sales. But back it up. Do you want to sell more products to existing customers? New products to new customers? Existing products to new customers?