Looking for general assistance/answers about map making.

Alright guys, I'm trying to learn here, but I am just absolutely retarded when it comes to this stuff. Making textures, drawing, modelling, all that stuff comes natural to me, it's importing and actually doing any coding or technical stuff I absolutely cannot wrap my head around. I am looking for someone who's willing to guide me through the process, because trying to learn via videos/guides, simply isn't cutting it.

My texture -


Image is 1024x2048

And my problem is I cannot find the image I place in the folder, place in the folder, as well as name the directory in materials file. I got textures to work, but only if I take someone elses folder, and name my file that. Well, I need to learn how to do it myself so I can do it faster than renaming a bunch of shit. Is there a folder for this kind of stuff? Where I can just place it and no matter what the game recognizes it?

P.s, apologies for being a whiny bitch.
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IT HAS TO BE IN THE DAMN BEAMNG DRIVE FOLDER WHERE IT IS INSTALLED.

I'm going to throw this computer out the window...
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And dimensions need to be same value ie - 2048x2048 or 1024x1024. Not 1024x2048 or the image will be squised.
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Actually no, textures can be as long as you want, go into decal road properties, then change texturelength from 5-10. So instead of squishing it it's leaving it the original size.
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Finally some progress!

 

bloody hell I don't even know how to save! I've added my touch to the Utah map, but I don't know how to save it.