You first buy texture items, they are just in the torishop and on market and all.
Then you upload pictures to them, those can be any pictures, but they fit better when they are special made for tb.
The cheapest are 128x128 pixels, then 256x256 and the highest quality is 512x512.
The more quality the higher price, full 128 costs about 30k while full 512 can come above 300k
You can buy textures yea