Hey there Gelly...
1) I use a Comp-Tac Paddle holster with the FBI cant as I've found it to be a quick and quiet draw, additionally, the paddle allows me to remove and replace the holster easily when entering no-gun zones (school, post office, work, etc.) or when adjusting it while in my vehicle.
2) The only accessories I use are a grip sleeve and night sight on the front of my G17.
3) I use 124 gr. +P Speer Gold Dots as my carry ammo.
For what it's worth. Good luck!