I'm installing a cold air intake, pedal command, and a stage1 tuner to my 2014 Camaro ss can i add them all at once or individually and run it in-between?

I'm sorry, see a local "tuner" shop near you for advice; no one here can really advise you about vehicle modifications, as they are very specific to your personal desires and needs and can also inherently cause major failures if not done properly with hands on experience.