All you really need is Adobe Photoshop (Adobe Illustrator is optional) and a place to print your shirts.
After searching the web I found a place that could easily print my shirts for me and even allow me t sell them to others without me having to do anything.
This is the website:
I've been working with this website for about a year now and have never had anything but good experiences.
So, on to the real instructable in which I will describe every step of the process...
Note: This instructable will not teach you how to use photoshop, it is based on the idea that readers already master PS to a certain level (not a very advanced level though)
So just read some tutorials on the pen tool and layers on such and you'll be ready =)
P.S. This is my first instructable, hope you like it =)
Step 1: Getting Ideas
If you don't have an idea, you can't design anything now can you?
I get ideas when I hang around with friends, see cool designs on posters or shirts or generally when weird things happen to me (which they do... a lot...)
Just look around and when you get an idea, try to write it down or try to make sketches so you won't forget.
Designing something for a group of friends is always a nice starting point and exactly what I will be doing for this instructable...