Well, first I buy a pair of t-shirts, some pens or pencils, and I also buy markers that I can write on, and some utensils and start designing my creation.
Then, I lay out in order the t-shirts, and label them so i know on which one to start on.
I lay out one of the pair of t-shirt and start designing the t-shirt.
Then, I use one of my utensils, I trace what i want to write, and use a marker to design what I want to design on the layer of the t-shirt.
Find out more on this site if you want to design like other beginners! There are good tips too!