leave it a good month or two before you polish/wax it, fresh paint needs to breath to harden off completely, hence if you wax/polish it your seeling the moisture in with is never a good thing as youll gain micro blisters in the paint....
as for washing it, your fine, but us a shampoo that contains no wax or at least very little....
also dont press on two hard when washing, as your paint will be soft still.....
hope this helps
matt