can someone give me a run down?

In terms of what you need to know as a freshman about fraternities (since sororities don't matter to freshman) is strictly party stuff

Wednesday - go to crow
thursday - go to fiji or lambda
friday/saturday - go to ato/sae or anywhere your heart desires

phi delt will seem like a good choice due to close proximity to freshman dorms, but its really lame and the brothers are akward

Sig chi can get kinda fun on the weekend, just because theyre dorky doesnt mean that they cant throw a fun dance party.

other than that, i think you'll just figure it out on your own