Looking for a marketplace to put my designs on merch

I'm not sure if this is the right place for this, if not direct me to a more appropriate subreddit.

So I've decided that I want to put my designs on t-shirts and other merch and due to the lack of money for inventory, I've decided that my best course of action is to use one of these sites that host designs and print orders for a cut of the profit, but I still feel out of my depth.

Does anyone have experience with these sites, recommendations as to which ones work best, provide best quality merch, best profit margin, and other relevant information?

Great design resource

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