TEXTURE MAKING IN ADOBE PS Thread

You don't want a texture in UDK, you want a material! So check Tutorials about making materials in UDK. The different textures (diffuse, normal, specular) are needed for a proper material. Diffuse is all the colors, normal is all the detail and specular is the reflectivity. You have one material, but three textures.

In order to fully understand this process, you need to look into 3D modeling programs, such as Max or the free Blender. The topics you need to search for are:

unwrapping, UV-Space, baking textures, nomal map, specular map, UDK basic materials 

There are uncounted tutorials on texturing for UDK. What you may need is a deeper understanding of the technology used in games.

ummm i need help with: UVing the model so that it can work with texture images
                                 Painting the texture images in Photoshop
And Just to make sure setting up the material in UDK
                                   

And If You Know How Can I Make A Reflection Effect For The Weapons Like Reflection From The Sun?

Do you have fireworks at all? I've used it for 3d textures in the past and am still using it for level design currently. But, back to PS, for your sniper, what effect are you going for exactly?