Just a reminder and good idea for y'all if you want to apply it. I'm not sure if you will be able to reset your rank after prestiging like in most recent cods. In BO3, you had to fresh reset to get 100% of challenges and waiting till you are 4th prestige or whatever you might be when you realize the challenge ( if it even exists)
It's a good idea in my opinion to just fresh reset, if possible, as soon as you prestige the first time. Your stats aren't gonna be good when you first start most likely, and you can start fresh with a lot better idea of how the game works and feels.

Give it a thought, you won't be disappointed.