Boneplaya and Richie have the idea going...
I mean, here's the universal 'step-by-step' to get you going on ANY 3Ds program...
1) Hit any icon [or search drop-menus for a selection] that resembles the dialogue "new _____ [polygon, object, file]"
2) Edit the SHIIT out of that thing. Make the object into the shape that you want.
3) Make / transfer textures.
4) Export.
5) Add to NL Track.
6) Re-size / re-position.
[7...]) Make sure everything has worked the way you want it, and if not, return to step 2 and re-shape the object.