Welcome to the forum! Congrats on the new rifle! Long range hunting and shooting is addicting! I myself started as a regular ol hunter, archery and shotgun mainly due to my area, avid bass fisherman, and general love for the outdoors. Once I got into long range shooting I was hooked big time! I've invested years and thousands and just love it and look forward to the next time I get behind the trigger.
Congrats on the new rifle! I've spend a little amount of time behind the rpr 6.5 creed and it's truly a great factory rifle! My suggestion to you would be to drop the most money you can afford on a quality optic. There is nothing worth then trying to do this with a sub par optic. I understand being new we aren't expecting nightforce atacr, Schmidt and bender or razor HD II, but look into something like a vortex viper hst, pst gen II. The Nikon black force 6-24x50 are a heck of an optic for the money and would make a fantastic scope to learn on. The crossfire doesn't have what it takes. There are more then a few bushnells that would step up to the game but I'm not too familiar with bushnell so won't try to recommend anything. Best of luck