2 seat Hyper Coaster supports and cartexture help

Yeah, I'm still trying to learn the NL ropes. So, I just built my new hyper coaster The Blue Blur, but it is floating in mid-air. So... I need someone who can tell me how to do supports for a Hyper coaster lift, and overbanked turns. Oh yeah, I also need someone to tell me how I can have custom cartextures. Thanks.

THE texture tutorial is here:
http://www.digital-experiment.de/tutorials.htm
The alpha layer is important nothing happens if its not there...

As for supports I tend to look at photos of real rides.