hello I am trying to make a logo 3D with a metal like surface to it and, if possible, some rust. It is for a rat rod site so the rust is kind of important. I will attach what the logo looks like. It may not be the best for making a 3d layer because of the way the letters are shaped but I did a quick look with photoshop 3d and it came out looking pretty good. The thing is, I understand making it 3d, but applying textures and other layers to make it's surface to look metallic and rusty I am having a hard time with. Also, would it be best to do this in Photoshop or would After Effects or Illustrator be a better software for what I am trying to achieve?
If you used "create 3d extrusion" from your graphic you should have a Extrusion in your 3D panel with some materials like front/back bevel/cap and extrusion. The first and last two are the edge and face of of extrusion, the middle layer (extrusion) is the side.
You'll want to select the front cap (second material) and then in the properties (showing the material properties) in the Diffuse you'll click the diffuse map and create a new file, this will be your color for the face. Paste in a metal image. Then play with the specular, shine, reflection and roughness settings. You should get a nice metal. If you need it to look better create additional texture maps for the specular, shine, etc...
Download the first issue of Photoshop Dimensions magazine (PDF), it's free and covers 3D in Photoshop (CS6 Extended, but the features are mostly the same).