I like HeviShot, #5, 3" 1 1/2-1-3/4 oz. You can also get 4x5x6 HeviShot from Nitro

http://www.nitrocompany.com

which I think is even better than over-the-counter "straight" HeviShot.
As for chokes, you might aspire to a tight choke with a high percentage of pellets at 40 yards, but I will caution you that a tight pattern at 40 yards means an even tighter pattern (read no pattern) at 20 yards, and I have killed more birds at 20-25 yards than 40.

Get a decoy, one or two hens will probably do.

Camo--can't tell you what Nevada woods looks like--I wear MossyOak Break-up. I think any pattern probably works. To me, the big deals are camo gloves and a camo facemask and camo hat. Gotta have those.

As best you can, sit in the shade and don't move when working a turkey.
Use a tree wider than your shoulders for a backrest/safety. You can usually add branches to create a makeshift blind.

If he's coming, shut up.

Get a pushbutton call first, then maybe a box call (I like my QuakerBoy Grand Old Master). You can add other calls like a slate, a glass, mouth diaphragms, etc., over the years.

You also need a locator call or two, probably a coyote and a crow for Nevada, though I'd defer to the opinion of any Nevada hunter for what works the best as a locator call in Nevada.

Watch a bunch of turkey hunting videos.

Don't wear anything red, white or blue. Be safe, think safety at all times. Know and be sure of your target. Too many hunters get shot by rookies (and others) who get excited, so be safe, be safe, be safe.

Get an orange tote bag for carrying your turkey out and bring your camera.