I would wash it as needed, twice a week would probably be enough to keep harmful contaminants from bonding to it , but if you are anal you may end up washing three or four times.
As far as wax, I would look into a sealant such as zaino or platinum. A carnuba based wax is really only going to last about three or four weeks, especially outside. A sealant actually bonds to your paint and will give you MUCH beter protection from the elements(which is what you will need). I don't know what color your car is , but you should look into a california duster and a quality quick detailer too(they can really save you some time).
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