Every situation in calling turkey's is different everytime you go to the woods. If you are inexperienced then less is better. It's real easy to overcall a bird. Remember you are going against nature anyway. Birds gobble to get hens to come to them not the other way and that is what we are trying to do when calling a bird.
I had an Ol'timer tell me the only calls I needed to know how to make was a basic yelp in 3, 5, or 7 note sequence a cluck and purr. you can call birds in all day with those three calls if you can learn the proper cadence and rythym and don't over do it. the other call sequences come later and are for competition if you ask me. I can do a kee-kee an assembly call, tree yelps, a fly down cackle, cutt like a fool with a box or mouth call but very seldom do I use those in the real turkey woods. I ain't out there to put on a show I'm out there to tag a wary ol' gobbler.
My rule of thumb is call just enough to keep him interested and let him know you are there.
As far as what kind of call to use. Box calls are great when it's windy cause the sound carries farther but you can use a box soft with a little practice. Slates are good for about whenever and I use a mouth call when I can't move and need to do a little sweet talking.
This is how I do it your milage may vary but you got to start somewhere. Took me four years of getting my butt kicked to take my first bird and I have taken a bird opening day ever since. I probably have made less noise on a turkey call in the woods in the last six years combined than I did the first two weeks I turkey hunted.
It's a blast and every trip to the turkey woods is still an education for me to this day.
When I first started I looked like I was going to war with a vest full of calls LOL now I take my favorite Irving Whitt box call two pot calls and strikers and two or three mouth calls maybe a wingbone and leave the vest at the house. (kinda hard to shoot a bow with war gear hanging off of you everywhere) LOL
Good luck, Kris