First Time Project Guidance

I am a first time project attemptor! I am looking for guidance on what Arduino Hardware and Shields/Sensors to use if I wanted to do a AC Voltage (RMS) Data Logger. I havent seen any posts previously in the forums that address this. Anyone that can direct me to where get this info I would greatly appreciate it.

datalog to SD card or something else?

Take a look at openergymonitor.org