+1 for the red dot! You definitely don’t “need” it, but if you can afford a halfway decent one they are worth the investment. We can find ourselves in some real awkward shooting positions turkey hunting, and the dot has made target acquisition so much easier.I would say most of that falls in personal preference.
1. I have better luck with aftermarket chokes, but you can make stock ones work just fine. Just try some different loads and see what patterns the best at about 30-40 yds, or further if you like.
2. I'm blind as bat, so I use a red dot on mine. You want something you're comfortable with and can find your target quickly and accurately.
3. Camo is probably the best option, I would say most people prefer/use camo for a dedicated turkey gun. That being said, I take several youths out every year, and we use a plain jane wood stock, blued barrel Mossberg with no issues. Turkeys catch your movement, not necessarily colors.