EARN BY T-SHIRT DESIGN

Here are some particular sites which provide a facility to order T-Shirts online with millions of customized logos.
The designers come to these sites , register themselves as Seller or Designer . By making logos over T-Shirts and other items , the designers , earn lots of money.
A designer makes designs over T-shirts , and make them available online for selling.The company or the site takes all the responsibilities , from receiving online orders for the T-shirts , printing , sending 
and receiving money. The designer takes a reasonable percentage commission upon the sold item of his design.
So you have to do nothing else , rather than to create awesome and attractive designs ,publish them and wait for selling.
Some of the popular sites in this regard are 
Teespring.com
and
Redbubble.com
Besides these sites . logo designing jobs and opportunities are also available in Fiverr , upwork 
Freelancer , Guru.com etc.