What I use and I know many others use as well load wise is something 3" 4 shot. I know guys are gunna praise one brand name over another and all that but in my experience between the 6-7 different loads that I've used is that they all drop them in their spot. I think the one I used for my last turkey was a Remington "Turkey Thug?" (may be wrong name but something similar) It did just as good of a job as any other i had used the previous years so IMO dont get hung up on what brand is better.

As far as camo goes and being a beginner you will more than likely want to conceal yourself to the max. Again camo brand isn't a big deal, but you will probably want to be out of a blind. Until you get the feel for just how jumpy turkeys really are you need to be hidden as much as possible. Turkeys have EXCELLENT vision and pick up on the absolute slightest movement so limit it and set yourself up so you have to move as little as possible.

That being said, good luck to you and hope your season ends with a bang!