I never hunted South Carolina, do you have any crops in your area. If so I would spend some time before season scouting the fields for sign or birds. Pastures or cut overs work about the same, they all provide food and nesting areas for the hens.
As most have said, I try to set up a blind in an area where they spend most of the day. This may or may not be close to
Where they roost. Plan on spending the day, you never know
When they will show up. I call about every 15 min. A little more aggressive in the morning and progressively softer as the day goes by. I always use two decoys, a Jake and a hen, DSD are my choice. It doesn't make a difference on what hen pose you use. The only reason I use a hen is because I am making hen sounds. The Jake will get you 90% of your shots. A grown Gobbler will just not allow a Jake to be near a hen. They will come in trying to kill it, very exciting.
Now for the last part, you didn't say how good a caller you are or what type of calls you use. I'll just say this about a mouth diaphragm call, unless your very, very good on one, you will spook more birds than you will ever call in. Get you a good
Custom made box and a Pot call, slate, glass whatever and learn to use them. Nothing sounds as good as these calls. Learning when to call and what call to make, is the art and science of this great sport.
Good luck to you.
RW