WOW! you rarely find an article like this online, really honest and full of value, I used to spend too much money and less time on the most important things and eventually I failed, I couldn't sell one shirt!! so yeah most people miss those basics or concepts, this article: https://successfulcampaignsblog.wordpress.com/2017/10/03/successful-teespring-campaigns-how-to-create-them/ explains how to launch a successful Teespring campaign for beginners, people also should read more inspiring stories about successful sellers on teespring but not forget that it's not that easy to succeed at all.