Hi all, this is my first attempt at a real model railroad.  I'd like to do a dog bone layout with a long stretch of straight track that leads on both ends to turn-arounds.  Picture something like this  0--------0 (nice huh?)  At this point I'm leaning heavily towards HO.

I've seen the bachmann auto-reverse e-z track (both straight and curved).  Is that all I need to use to make this work?
Also, how much of the layout needs to be auto-reverse e-z track?  Does the entire layout need to be auto-reverse (0AAAAA0), or can it all be plain e-z track (or even flexible track) with auto-reversing pieces immediately before each turn-around loop?  0A-----A0

Finally, if I actually plan on having two dog-bones that intersect each other (not reusing track, but just a crossing), do I need to do anything different?

Thanks!