Starting out, you can't go wrong with a Lynch box call. I would also recommend a good quality friction call like a slate and or glass call. They too are easy to master and give you an addition sound or two. They are also relatively inexpensive and afforable.
Turkey hunting though is much more than calling. Anyone can call and get responses. The key is learning and understanding how to tip the odds in your favor. That usually comes with encounters where you loose more than you win. It's called experience.
Listen to turkeys and try to duplicate sounds that hens make. Watch them when you get the opportunity and you'll see they call infrequently while going about their daily routine of moving from one area to another, scratching and feeding among other things like being bred.
Like the old saying goes, patience is a virtue when it comes to hunting turkeys. If you fail early in the day when say a bird hangs up, goes the other way, whatever may be the case, just remember you have the rest of the day to try to relocate and try over and over again if you don't tip your hand and spook them. Through those efforts you gain valuable experience and start to understand what to do and what not to do in regards to their daily activities and movements.
It's a great time to be in the field and you never learn enough starting out. Just put in the effort and time and you'll eventually be rewarded.