Some have likened that strategy to investing with training wheels, ie it’s extremely low risk and a great place to begin.

That is work many aren't willing to do, so you are well ahead of the game.If you want to perfect your sourcing game and generate the best leads for the smallest cost and smartest activities, I think you should find a wholesaler (maybe @Lydia T. who has given you some great advice) so you don't have to reinvent the wheel.