Hey, the title says it all. I'm looking for help and tips on how to create custom textures for things such as floors walls trees etc. I'm a noob at making maps and such so I'm asking here on how to make the things I need because no one I know can help me in the way I need . Any response is greatly appreciated, thanks

http://lmgtfy.com/?q=custom+textures+world+at+war

You must have misunderstood what I wrote. I meant that I need actual custom textures, not pre-made textures they need to be custom and have the things that I need implemented in them

Ohhh lol

There's some sites where you can browse through different textures, some don't even need you to give credit (read carefully IF they want you to though). You can try your luck here: http://www.cgtextures.com/

If you really try to make your own ones it would be a good start to take some photos of walls, floors etc. and edit them (for example via gimp) to make them borderless and fitting but it's unlikely that someone will do that for you.
If you have further questions on making them yourself however you will always find someone who'll at least try to help you(: