1st time noob. Questions on detailing/products

Hi guys, I found this site from searching on google. I have a garage but I don't have any space to wash the car at home. Is it ok if I washed my car at a coin op/touchless wash, then use a waterless wash, then clay/wax? I purchased my car in January 2016 and the previous owner had it polished/wax for me when I picked it up. Would the car need to be polished again or can I go straight to wax/sealant after the wax?

Do all waterless wash contain a wax additive?
Is the griots clay bar a fine bar? I'm assuming I wouldn't need an aggressive bar if the paint doesn't have much contaminants? Would a meguair's clay bar kit from walmart be as good?

Do claybar or iron x remove the old wax?