COMMUTER FLC DEPARTING NON TWR ARPT HAS NMAC WITH A TWIN CESSNA LNDG AND NOT ON CTAF. PROX OF TFC. EVASIVE ACTION.

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LEAVING THE GATE AT IYK; WE ANNOUNCED OUR INTENTIONS TO TAXI TO RWY 20 AND MONITORED 122.8 WHILE WE TAXIED TO THE RWY. NEAR THE END OF THE RWY; WE PERFORMED OUR 'DAILY CHK' ON THE ACFT. AS I POSITIONED THE ACFT; MY FO ANNOUNCED THAT WE WERE ON THE RWY AND WOULD BE DEPARTING S. AFTER A VISUAL SCAN; WE STARTED OUR TKOF ROLL. JUST PAST MY ANNOUNCEMENT OF V1 (FO PF) MY FO STATED THAT THERE WAS TFC LNDG RWY 33; BUT THAT IT APPEARED TO BE GOING AROUND. THE ACFT; A TWIN CESSNA WAS; IN MY JUDGMENT; CLBING. I INSTRUCTED MY FO TO HOLD ALT UNTIL WE WERE CLR. SEVERAL MINS LATER; THE ACFT CAME UP ON 122.8; IDENTED HIMSELF AS NXXXX A TWIN CESSNA ON A CHARTER FROM N LAS VEGAS. HE WAS INITIALLY VERY RUDE AND UNCOOPERATIVE. AFTER A FREQ CHANGE TO A DISCRETE FREQ WE CONTINUED THE DISCUSSION AND HE CALMED DOWN. A LESSON IN THE IMPORTANCE OF MAKING BLIND RADIO CALLS AT UNCTLED ARPTS -- EVEN AT XA00 IN THE MORNING! NOTE: IN THE 'FLT PLAN TYPE' BOX I NOTED VFR/IFR. SINCE IYK IS IN AN MOA (CHINA LAKE--EDWARDS AREA) WE FILE A COMPOSITE FLT PLAN WITH THE IFR STARTING AT PMD VOR.