what coating are you planning on using? Before claying i would do Iron remover step...What pads and polish you have??..i would use M205 with white polishing pad.. IPA wipe down after polishing to remove any oils from polishing step. (Carpro Eraser, Gyeon prep or any wax and grease remover from auto parts store) your car only needs light polishing to remove any dealer installed swirl marks...
If I was applying coating to my car I would do the following:
Ironx the whole car..
Rinse it before washing..
Wash it with Purple power vehicle and boat wash Available at walmart..
Clay (I use soapy water while car is still wet)
Polish (Any light polish with white pad)
IPA wipedown
Coating..