regular

Regular pattern

You can buy special t-shirt transfer paper that you can use with a regular printer, print out the design on to the paper and then iron the design on to the tshirt

Basically its a blanket of heavy hydrogen (deuterium) around a "regular" atomic bomb.

There are many different kinds of "design" training. First you would need to figure out what kinds of design you would like to be doing. Most colleges offer course on graphic design and even regular art. Start with your local community college and go from there.