RE: NEW ?????????
Definitely carry a bolt with ajudo point and just shoot the thing rather than trying to let down. Saves you the strain and gives you that extra little bit of practice if you pick a specific target, like leaf on the groundor something like that, to shoot for.
Feathers vs vanes... I'dbe inclined to follow Horton's recommendation, but thenI'm kinda retro so Iprefer feathers anyway. Try both and find out which works best.
Broadheads - Bear Razorheads, Magnus Stingers,Muzzy, Thunderhead, SlickTricks... Any good quality headwould work but you would likely find that some are probably more accurate than others from your setup. Even crossbows have their preferences.