you should be able to pick up some superthirive at a local store wal mart usually has it its not really a fertilizer more just vitamin and it helps prevent transplant shock and you should look into picking some up.
when you get your nutrients would start feeding them at 1/4 recomended strength to start with, then gradually increase every time you feed, your yellowing problem will probably continue to spread until you start your nutrients and get up to around 3/4 - full strength nutrients, but losing some of the lower leaves is not that big of a deal so wouldnt worry to much about it.