TBM700 DEPARTING EYE ARPT HAS NEAR MISS WITH ARRIVING ACFT.

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ARRIVING AT THE ARPT; I STUDIED THE COMPUTER RADAR; RECEIVED A FLT BRIEFING; AND FILED A FLT PLAN TO MVN; A 45 MIN FLT. MY PLANE WAS TOPPED OFF AND PULLED NEAR THE FBO FOR BOARDING. THERE WAS LITTLE OR NO ACTIVITY AT THE ARPT. I ASKED THE FBO WHICH RWY THEY WERE USING AND SHE POINTED TO RWY 3. THE WINDSOCK SEEMED TO AGREE WITH THIS CHOICE; ALTHOUGH THE WIND WAS LIGHT AND ALMOST 90 DEGS TO THE RWY. I STARTED THE PLANE; LISTENED TO THE ASOS; WHICH DID NOT MENTION THE ACTIVE RWY; AND CALLED DEP CTL FOR MY CLRNC. AFTER COPYING MY CLRNC; DEP CTLR INFORMED ME THAT THERE WAS 1 PLANE IN THE AREA ON A LONG FINAL AND I WOULD WAIT FOR HIM TO LAND. I WAS INSTRUCTED TO TAXI TO THE ACTIVE AND ADVISE WHEN READY; WHICH I DID. I STAYED ON DEP CTLR FREQ AND DID NOT USE UNICOM AS I WAS UNDER THE MISTAKEN IMPRESSION THAT THIS WAS PROC DEPARTING IFR. THE CTLR WANTED TO KNOW MY 'ON COURSE' HEADING TO MVN AND I WAS FLUSTERED THAT I COULD NOT EASILY FIND THAT INFO ON MY NEW GARMIN 530'S. I SPENT TOO MUCH TIME TRYING TO FIGURE OUT THAT SIMPLE REQUEST WHILE THE ANSWER SAT THERE FOR ME ON THE EFIS. I WAS CONFUSED BY MY INABILITY TO RESPOND TO SUCH A SIMPLE REQUEST. (THIS IS MY SECOND TBM; WITH GARMIN VERSUS KING RADIOS AND EVEN THOUGH I HAVE ABOUT 75 HRS IN THE NEW PLANE; THE GARMINS ARE NOT AS INTUITIVE AS THE KINGS I WAS USED TO.) THE DEP CTLR TOLD ME THE OTHER PLANE WAS ABOUT A MI OUT AND IF I COULD DO AN IMMEDIATE TKOF; THAT WOULD BE APPROVED. I ACKNOWLEDGED IMMEDIATE TKOF; TAXIED ONTO RWY; BEGAN MY TKOF ROLL AND WAS ASTONISHED THAT THE HEADING INDICATED 030 DEGS AND NOT 210 DEGS. HAD THE SLAVED GYROSCOPE DONE A 180 DEGS BEING MOVED ON THE GND. NO; THE COMPASS AGREED. I WAS; IN FACT; AT THE WRONG END OF THE RWY; WHICH I RPTED AS I LIFTED OFF. JUST THEN THE PLANE ON FINAL BROKE OUT; FLASHED HIS LIGHTS AT ME AND VEERED OFF TO THE R. THAT WAS CERTAINLY THE WORST MOMENT OF MY FLYING CAREER; AND THE DUMBEST MISTAKE I HAVE EVER MADE! I BELIEVE THAT I ACKNOWLEDGED TO THE DEP CTLR THAT I WAS AT RWY 21; THE ACTIVE RWY; BECAUSE I THOUGHT THAT I WAS AT THE ACTIVE RWY. STRANGE ARPTS ARE SOMETIMES VERY DIFFICULT TO FIND YOUR WAY AROUND -- THIS IS A SIMPLE STRAIGHT FORWARD NON-CTLED FIELD WITH 1 RWY. YOUR CHANCES OF BEING AT THE RIGHT SPOT SHOULD BE GOOD. THERE WAS SOME DISCUSSION BTWN THE OTHER PLANE AND THE DEP CTLR ABOUT WHAT AN IDIOT I WAS -- RIGHTFULLY SO! IN RETROSPECT; I HAD WAY TOO MUCH ON MY MIND THAT MORNING TO APPLY THE TOTAL CONCENTRATION NEEDED TO PERFORM THE JOB. FLYING IS A VERY BIG PART OF MY LIFE AND MOST OF IT IS DONE AT CTLED FIELDS WHERE I EITHER KNOW MY WAY AROUND; OR ASK FOR PROGRESSIVE INSTRUCTIONS FROM THE GND CTLRS. 99% OF MY FLYING IS IFR. I THINK I EXPERIENCED 'SPATIAL DISORIENTATION' ON THE GND.