The t shirt business is over saturated and the profit margins are quite small. I don't think it is a business worth going to. The only real positive is that you can start it with very little capital. If you have a small budget and determination I say go for it but don't expect to make a fortune.
And maybe oversaturated is an understatement...
There are 8 custom printing shops with tshirts, cups, pillows etc etc, one in every superstore in my city.
There is at least one (in a case I know 3) in every mall in the city and we have 6!
Let's throw in the shops and the dedicated websites and I think we have at least 50!
How many people would want a custom t-shirt and how many would want one more than once a year?
Even if we say 1% it would mean 10 000 customers split between 50 business over a year..
so , OP:
Ofcourse i will start first in my country and have a feasibility studies first. Any thoughts about it?
First thing you have to check is how many people are doing the same in your area or town.
6. Custom cat/printify will fulfill your orders and ship to your clients
Shipping will kill your business as the cost would double the price for a t-shirt.
Why would you want to order it online when you can go to a store in your neighborhood, check how they look in real life and have it by next day?