Rush how difficult is it for new comers to break into it?
Not as difficult as you would think. I have met some truly idiotic people in this industry who do very well for themselves. If you're selling t-shirts and you're commision is $12-15 per sale, you need to buy FB Ads/Traffic and if your targeting is good enough you can spend a couple bucks and have good margin leftover after ad spend and that is your profit. Then you just do that at a larger scale with more shirts.
What I tell people is find 1 shirt design or product if that is the route you would want to go, and focus on being profitable with 1 shirt. Then slowly scale up to 3-5-10-20-50-100, etc.
A main issue I see "newbs" struggle with outside of the Teespring world is using landing pages that just don't convert. Buy button above fold, large green buy now button, etc. Simple things but when you add them all up it makes it really easy to land a conversion/sale.
Generally if 10 people give it a go, you see 6-7 people "get it". Usually 1 out of that 10 will do very well. My stepdad has jumped in, my brother's brother in law who is a full time cop but made more money selling shirts online with Teespring than he did working at the police department, etc. It really just takes a strong will, a willingness to learn, and understanding that you will have failures but the idea is for your winners to pay for your losers on top of that. The best part is EVERYTHING you need to learn how to do e-commerce is free and available on the web if you're looking in the right places. Reddit has a solid e-commerce/shopify subreddit and then there is a Teespring University section where they teach you in the ins & outs of selling stuff online with ads. Even if you don't want to sell shirts, that will teach you the basics.