How to combine multiple textures into one?
@Anonymous
I have to ask why you think it is necessary to combine the head mesh and the body mesh into a single mesh and then create a combined texture map? This is definitely doable, but you emphasized that you are extremely new to max but also seek a simple and straightforward solution. Do you just want a simple render of the scene from a few angles? Do you want to animate the character? Do you want to create morph targets for the face to allow for facial expressions? Are you staying entirely within Max for this project or do you intend to export it to a game engine or other software?
But you do not absolutely need to combine the head and body mesh to accomplish any of the above with the exception of exporting outside of Max in certain circumstances. As I am primarily staying within Max for my rendering, I typically keep the head and Body mesh separate. However, sometimes it is convenient to combine the head and body (e.g., for skinning purposes) and so all you have to do is to apply an edit poly modifier to say, the body mesh and then click Attach in the Edit Poly rollout and then select the Head. Accept the defaults from the Attach options dialogue. Max will create a multi/sub-object material and place the existing head an body texture maps in separate ID slots. You don't have to do anything further.
If you are staying within max you have 2 very simple options, one of which is nothing at all.
FYI, The character above was actually animated with the head and mesh separate, but I just placed the edit poly modifier on the body mesh and attached the head to show you how. Hope this is clear and helps.