first, make sure that you're at the southwest airlines ..area. go up to a kiosk/computer thing put in your info and your confirmation code and it will print your boarding pass. then go to the counter and give the lady/dude your boarding pass and check your bag(s). then go through security, where you will have to show your boarding pass and ID, again. then go find your gate and wait. it can be confusing to find your gate, but if you have any lick of sense, it shouldn't be hard. if so, just ask an airport employee. if you do happen you go to the wrong gate, when the plane is boarding, they wont let you get on the wrong plane, because again, they will check your boarding pass to make sure you're in the right place.
don't stress, it's really no big deal. i just flew from charlotte, nc to the biggest airport in the world, (at least i think it is.. ) the chicago o'hare last week, and i'm flying back on monday. i was freaking out too, but when i got there, it's was so simple. but watch out when you go through security, they can be bitches. oh, and you have to take your shoes off. how gay is that. if the cops make you do that, in south carolina, it's considered a strip search, and is very much illegal. unless of course you've been arrested.
i'm sorry, this has gone on long enough. hope i helped!!