Bolt action will be ok, AR is more better.
Get a good tripod, the lighter the better. Good ball head as well and an Arca Swiss plate to mount on the gun.
Pulsar, Trijicon, Bering, AGM, iRay will all make a good optic. Decide on how much you want to spend and go from there. I would recommend a minimum resolution of 384, go 640 if you can swing it.
Thermal handheld spotter will make life easier but not necessary. You will just spend more time on the gun scanning without it.
Welcome to the addiction
My setup: 12" 6.5 Grendel SBR, Vox S, REAP IR (have a Bering Super Yoter on order), SiCo Radius rangefinder, and a Shadow Tech tripod. Carbon fiber tripod is on the short list to cut weight. I also run a helmet mounted PVS-14 for waking in and out.
ETA: Kill from this past Friday