Custom Model Help

[enk]

I also have no idea how to texture...

Do you mean make a texture itself?
I highly recommend gimp. Just play around with drawing stuff, making layers and bump mapping. You can get a plugin for .dds files, and normal maps.

If you already have textures, here's how I got them to show in editor. Mine were invisible too until I made a .mat file.

make a .mat file in the model editor.
Click on your model, down where it says mat there's a '+' sign.
Click it, this opens the material editor.
Make the type solid diffuse, tick the diffuse box and select your texture. Make sure the texture has the same name as your .dae file and is in the same folder.
Go file, save as and save it with the same name as everything else, in the same folder.

In model editor, next to where it says mat, click the '...' button, now select the .mat file you just created.

Save it and close.
Now when you open the model editor again, you can import mesh and your model should be textured. Click the 'gears' button down the bottom to view how it will look in game.

If it's invisible, this might be a problem with how the model has exported. In blender (and 3dsmax I believe) The model needs to be 'unwrapped' before it can be textured.
I'm new to this stuff as well so I'm still learning it.
I've been able to blender stuff working for simple things, I made a post in the thread 'new tutorials' explaining how I did it.