Hi there! I have done a lot of structure mapping on PS, if you want to take a look at the maps I have in the WIP structure folder. They may not be perfect, but they could be a place to start--I'm always happy to share my techniques.
As far as tips go:
Open a file in PS and make it 1x1 inch with a transparent background (at 300 DPI if that is what you will be working in) then select all, edit>stroke 1 px. Then edit>define pattern. Then you can just use the "pattern fill" paint bucket tool, and blammo--you have a 1 inch grid you can work with.
Genetica Viewer and Wood Workshop are great tools for whipping up quick tileable textures, such as wood grain, floorboards, etc. I am pretty rubbish when it comes to actually drawing, but you would be amazed what you can do with good textures and layer effects.
I find the layer effect 'outter glow' is better than 'drop shadow,' in general, for making things pop. Plus, if you are doing rotatable tiles, you don't need to worry about shadows going in wonky directions.
If I think of anything else, I'll let you know!