There are a lot of ways to sell t-shirts. What is your model:
-Custom - small volume (print your own)
-Custom - print on demand (POD) higher volume
-Brand - your own brand and specific designs (no custom), using POD service
-Brand - your own brand, but you do your own printing
There are a lot of variations on these themes, as well, such as buying pre-printed transfers and pressing them yourself, HTV, screen printing, digital transfers, and many more. I would peruse the board and try to better define what your business model is. There is no simple way to respond to your question,
-Custom - small volume (print your own)
-Custom - print on demand (POD) higher volume
-Brand - your own brand and specific designs (no custom), using POD service
-Brand - your own brand, but you do your own printing
There are a lot of variations on these themes, as well, such as buying pre-printed transfers and pressing them yourself, HTV, screen printing, digital transfers, and many more. I would peruse the board and try to better define what your business model is. There is no simple way to respond to your question,