I'm late to the game, but if you want it perfect, you'll need a thermometer you can leave in the meat while it roasts. The couple times I've done a ribeye roast, they've come out delicious. Step one is to season it days in advance, then reverse sear:
1) Multiply your roast's weight by 0.015. Best to operate in grams here for simplicity. This will determine your salt quantity. 6-lb bone in roast comes out like this. (6 lbs. = 2,722g) x 0.015 = 41 grams of salt. Use a kitchen scale and Kosher salt. From here, whatever seasoning you'd like. Lots of pepper for me, a bit of garlic powder, and that should be it. I've also used fresh rosemary sprigs as well. But coat the entire roast with ALL the salt & seasonings, then wrap it tight in Saran wrap and keep it refrigerated for at least a day.
2) After your seasoning time, take the roast out and let it come up to temperature from cold fridge temps. this may take a few hours. Put your thermometer into the center of the roast between a couple rib bones.
3) In a 225° oven, take your roast up to your doneness temperature. I like 126° for a nice medium-rare and bright pink finish. Depending on your audience, you may want to get it to 132°, but I wouldn't go higher than that or it'll be overdone. It should take a good couple hours at this point.
4) Once it reaches your desired temperature, pull from the oven and loosely tent the roast with foil. Let it rest on the countertop for at least 30 mins to an hour, if not a couple hours.
5) Turn the oven as high as it'll go, 550° if possible. Once it's good and hot, put the roast back in and blast it for 7 minutes tops. Meat's already cooked & rested, so all this is doing is getting a nice charred brown crust. It's probably gonna smoke like hell, so I like to do this on a rack over a cookie sheet with a little bit of water in the bottom. Once you pull it, you can slice it as soon as your hands can deal with the heat. Use a thin knife to peel the bones off, then slice to whatever thickness you want.
6) I like to simmer some peppercorns, garlic, and rosemary in a pot with some beef consommé in it for au jus.
**Bonus points for using a smoker at 225° in step #3. I like to roll smoke for about 30 minutes, then continue in the oven as described