erm... i think u bttr get started by learning ISO, Shutter speed and F-stop. Then when you are well versed with them... then u play around wit it. u shld also learn all the metering indication in ur cam's viewfinder. learn wad is the indication shown. if 1/1000... normally at low light the signal LO appears in S mode. if u play wit M mode 1st, then u will c tht there is a bar at the bottom n u shld adjust both ur shutter speed n f-number till the exposure is rite.
dun jump directly into something u dun really understand. check out the manual and also the jargons properly... i am sure u will enjoy it.
goood luck n happy learning