Where To Start on the Green Lantern, Wonder Woman, Superman, and Justice League. Hello everyone,

I'm fairly new to comics. I started last summer with Batman comics, and boy did I love them. I soon expanded to Nightwing, Batman and Robin, and Green Arrow. I've been wondering, where should I start with Green Lanter, Wonder Woman, Superman, and the JLA? Should I just read New 52? What New 52 stories should I not waste my money on? What kind of prior konwledge would I need (particularly Green Lantern and Wonder Woman).

Thanks. 