HOW DO I get audio or sound for my PROJECTOR?

[lion2324]

i recently bought an Optoma DLP home Projector from staples and found out there are no built in speakers. and there are only four connections : VGA, RS-232, The yellow video jack (there are no red and white audio jacks), and an S-Video connection. they supplied me with just a VGA cable. I also bought an HDTV DVD player and i have no clue how to connect it and as well connect audio since they dont have it on the projector. I NEED HELP!!!! and is hdmi the connection to watch stuff in htdv quality? what should i do? should i buy another projector?

 

[ffg7]

use external speaker system as better then the builtin speakers of TV's & monitors.