When do I put the nesting box up for my parakeet to start breeding? Have had the females 1 year and just got the males.Jst put the males in the cage with the females today

Here is all the information you need and then some. Breeding Budgies / Parakeets (http://www.budgieplace.com/breeding.html)

You say "femaleS" and "maleS". Are you attempting to breed multiple pairs in the same cage?