Re: casting distance
Seriously, I would work very hard at perfecting the basic casting technique before trying for great distance. Taking this in steps will make you a more well rounded fly caster.
With a good, solid foundation you will eventually be able to do everything you need to with grace and uber-smoothness. Between your feet and that 90' cast are many fabulous casts that will help you catch fish when others can't.
Also, just starting out I would highly recommend getting a lesson or two from a certified casting instructor. Some charge, some don't, but in any respect you will find the learning curve greatly reduced and you won't waste hours and rotator cuffs correcting bad habits.
Just a little advice. Okay, maybe a lot.