Hello I'm new and I could use some help with blender.

[Mercz37]

Hi. I'm new here and I was just wondering how to do a few things with blender.
1st. I need to know how to edit a texture map in PNG form inside of gimp.
2nd. I need to know how to port the model to .mdl, .vtf, and .vmt for use in tf2.
any help inside of this would be great.