How do I know I am making the right decision?

A right decision has three marks. It fits your current stage, not the business you hope to have someday, but the one you run today. It fits your real budget, a number you can sustain for months, because marketing compounds and one-shot spending rarely does. And it fits your goal, leads now versus system for the long haul. Notice what is not on the list: perfection. There is no perfect first choice, only a sensible one worked consistently. Get those three fits right, start, and adjust as you learn. That is how every good marketing decision has ever been made.