Clear tubs in the right size(s) until they're big enough for your AP cages. Ambient humidity between 40-50% is good, with more added during shed cycles.
AP Cages are expensive. If you're set with just one snake for now, do the tubs and then buy your cage later. Also, unless you buy Quick Ship stuff, you're probably not going to see your order to at least 90-120 days at this point.
Paul