For the private land (if the land around it is not hunted too much). I would scout it and see what you got running around. If you got a bunch of jakes (on his property or sorroundings) and no toms then get two hen decoys. If there are some toms, jakes and hens then I would use one jake and one/two hen decoys.
for the public land, unless there is a crap ton of birds...I only run with one hen decoy.
For the calls. Get one of each and see which ones sound best. I learned A LOT about turkey hunting by buying the turkey hunting DVD (primos, HS, drury, realtree) etc. I learned about calling, how much, how little, when and what to sound like given their situations. ...(this was when I first started out). You can also go online to find different sounds they make. When you buy the calls (slate, box, push button, etc) see which ones you can get to sound like that. I used that knowledge and applied it and my learned lessons in the field from there on out. I have bagged (at minimum) one bird a year for the past 12 years on public land.
Do not get caught up on worrying about sounded too much like a bird. I have heard some of the most god awful sounding calling in my life on public land and watched him bag a jake. Always remember, less is more with turkey hunting.
I like and have been using Featherlite decoy 3 position hens.