Patience, Patience, Patience.
A sense of Humor.

Those are the first 2 that come to mind. Patience because that is one thing that turkey hunting will teach you. Not getting too anxious is the hardest thing to overcome. You'll find the urge to call too much or move to frequently. I say the sense of humor because the turkeys will do things to stump you and out smart you that if you can't laugh, you really shouldn't be hunting them. Soon, You'll understand what I mean.

Seriously, get yourself a good vest with a comfortable seat because you will want to be able to sit still and steady for a long time. You'll need all the pockets for all the calls that you will have in your arsenal. If you haven't started to practice with a call, find one or two calls that you can master and start with them. Add other calls as you master the first one. Practice over and over with your gun to make sure you are confident of how far you can shoot accurately. Find yourself a few videos that not only show the hunt but also teach you about the bird, the sounds they make etc. Denny Gulvas is from Pa and he makes some awesome videos of footage of wild turkeys all filmed in the mountains of central Pa. he gives great tips and advice and throws in a few hunts as well.

Most importantly, be safe and welcome to the great addiction of turkey hunting.