For calls, I would suggest learning how to use an open reed call. You can also get and use some closed reed calls, but a well made open reed can make many different sounds.
Eventually you make check out the diaphragm calls for totally hands free calling!!
I would also recommend a decoy of some kind. A coyote likes to come to the edge of cover close to where the sound was coming from and stop to get a visual confirmation. This is usually when they spot your head moving back and forth.
Make sure to play the wind! If the coyote hits your scent cone the game is over!!
I also carry a shotgun with me to each stand. I have had a few coyotes surprise me with a fast approach.
And one more warning:
IT CAN BE ADDICTIVE!!!
Enjoy!