I have use RFID tags before for identifiying 2000+ persons to get access to a system. These tags were quite pricey and included a photo ID.
I recommend you just buy a set from Sparkfun and play with it, to learn their "behaviour". The most important limitation (or strength:) of an RFID it the range which is rather small (<10 cm / 4 inches). You cannot adjust the radius (not true but rather difficult for a beginner.
Arduino can play simple sounds, and the more you pay for shields etc the better the sounds becomes
Your requirements. You can start with the tone library which is free.