hi!
i would really like to start creating my own media for game guru but i don't know how to start. i need a motorboat!
i tried to use blender and i'm familiar with gimp.
are there some step by step tutorials to realize an idea to a GG ready model?
i don't know how to add textures to an x model i imported, f.e.
does anyone have a good tutorial or can help me somehow? there are so many things i have to connect to understand the whole thing.

He are a set of tutorials specifically made by one of our forum members.
https://forum.game-guru.com/thread/208184#msg2482421
Searching Google for blender tutorials will yield many results to look thru.

Start with simple things like creates and work your way up to building and characters.

There are a LOT of good Blender tutorials on YouTube! The ones I frequent the most are Andrew Price (he's the Blender Guru after all, what could be more appropriate?) Blender for Noobs, BornCG, Blender Cookie, and Sardi Pax. There are many others, though!

Thank you Jerry.

thank you guys that's what i was looking for. this is going to be much harder than i thought! thanks a lot for the links!

nothing is easier then wings 3d for modeling. Has mirror etc and does a great job. Very simple to the point interface. it also exports in direct x and works really well for Guru. For texturing I would recomend sculptris. Sculptris can create your high poly models from your low poly for creating normal maps etc and can paint normals directly onto your texture in paint mode. Blenders direct paint to normal map sucks.

My work flow is:
Model and uv map in wings 3d.
Export to object format and use object in sculptris to create high poly mesh. Save out high poly mesh and low poly and then create normal map, spec etc in
X-normal.

All these apps are 100 percent free to use and rock.

P.S or you can just sculpt your models in sculptris and then reduce resolution in sculptris, I do this for simple models like rocks logs helmets and so on.

Best Of Luck!