Welcome!
I am sure you will hear from people with other ideas, but I perfer helical fletch, with one exception. If I shoot four fletch, I use four five and one half inch feathers. With that much steering, you don't need the helical.
Having stated that exception, I use the most radical helical fletch I can get, not because I need it, but I just love the artistic way they curl around the shaft.
The problem you will run into with a radical helical is quill contact with the rest, any contact can really mess up your tune. I do a lot of triming on my rest, and spend a lot of time twisting my nocks before I glue them on.
Truth is, if you get the best tune you can get, a four or five degree fletch will do just fine. With my set-up I give up a bit of down-range speed, because of the radical twist of the feathers. It is not really that much of a factor for me, as my hunting shots are never more than 35 yards, with most being 25 and under.
Check out what the rest of the guys and gals here have to say, hopefully you will find something that you like. If you are like me, you will likely experiment a while before you settle, that can be a good thing. Shoot Straight!