Blender textures/materials in studio - how?

i am very bad at modeling, so i use blender’s color attributes to color my models, because textures just don’t work :((

so how can i go from a model like this:

to something more like this?

do not tell me to “add more detail” i know that, i just want to use textures instead of colors for the models but idk how!!

Have you tried googling first?

unwrap the uvmap of the gun you made, edit in a program like paint dot net