How to build a SaaS product and scale it?

Would love your feedbacks on how to build a SaaS product and scale it? What areas would you advise to go into and when selling the product how do you think I should approach to sell it? I don’t have that much money, earning a fixed salary every month and wanted to start a product and eventually would wanna turn it into business. Right now I’m only thinking to build the demo and give to some friends to use it. I’m totally new to this. Would appreciate all the feedbacks. I might as well invest maybe $100-$200 per month for this. Do you think is it possible to do that with such little money? And how much time do you think it takes to eventually find clients and turn to profits.

Author: StraightDog2740