You will want a fuel rail that uses -8an if you are planning on using ethanol. From your -8an feed from pump, you can get an -8an T piece that will allow you to run two -8an lines to either end of your fuel rail. The -6an return would then lead to your FPR. Your FPR output should then go to your flex sensor, and the output of that goes to your tank.
There's quite a few decent FPR's out there these days. Personally I've used AEM, Turbosmart, HKS, Aeromotive and never really had an issues, that said I don't tend to run e85 a lot so maybe someone has some good recommendations for that. Just don't use a replica FPR cause they always fail.
In terms of sensors, I believe Syvecs sell fuel pressure sensors.