EXTREMELY LOW TIME CFI ON INST TRAINING FLT WITH STUDENT DID NOT MONITOR CTAF AND TOOK OFF WITH 3 ACFT LNDG IN THE OPPOSITE DIRECTION.

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MY INST STUDENT AND I ARRIVED AT THE ARPT WITH PLANS TO CONDUCT AN IFR XCOUNTRY TRAINING FLT. I HAD CONDUCTED A DUAT BRIEFING EARLIER; WHICH INDICATED CALM WINDS. THE WINDSOCK AT THE ARPT AGREED; ALTHOUGH IT WAS LIMPING TO THE S SIDE; INDICATING LIGHT WINDS FROM THE N. AT THIS PARTICULAR ARPT; WHICH IS UNCTLED; RWY 18 IS USUALLY USED IN CALM CONDITIONS. HOWEVER; I NOTICED AS WE CONDUCTED OUR PREFLT INSPECTION THAT A COUPLE OF PLANES HAD TAKEN OFF TO THE N; BUT ALSO SOME WERE USING THE 'USUAL' S RWY. THIS SHOULD HAVE BEEN A CLUE AS TO WHAT CONFUSION MIGHT OCCUR LATER. PRIOR TO TAXI; I SUGGESTED TO MY STUDENT THAT WE USE RWY 36 SINCE THE WIND WAS SLIGHTLY FROM THE N; ALBEIT VERY CALM. HOWEVER; AS WE BEGAN OUR TAXI; WE NOTICED SEVERAL ACFT TAXIING TOWARD RWY 18; WHILE NONE COULD BE SEEN AT THE DEP END OF RWY 36. SO WE DECIDED TO USE RWY 18 AFTER ALL. WE GOT INTO POS WHERE WE COULD CONDUCT OUR RUNUP AND CALL FOR OUR IFR DEP CLRNC. WHILE WE WERE DOING THIS; WE WERE NOT LISTENING TO THE LCL CTAF. CLRNC DELIVERY TOLD US TO INFORM THEM WHEN WE WERE #1 FOR DEP. AFTER WATCHING THE ACFT IN FRONT OF US DEPART; WE CALLED CLRNC FOR OUR IFR RELEASE. UPON BEING RELEASED WE SWITCHED TO CTAF AND ANNOUNCED OUR DEP ON RWY 18; AFTER QUICKLY CHKING THAT FINAL APCH TO RWY 18 WAS CLR. UPON TAKING THE RWY; SOMEONE SAID OVER THE CTAF 'YOU HAVE AN ACFT LNDG ON RWY 36 IN FRONT OF YOU.' THE LNDG ACFT SAW US ON THE RWY; HEARD THIS ANNOUNCEMENT AND ANNOUNCED A GAR. SINCE WE WERE ALREADY ON THE RWY; AND FEELING SOME PRESSURE TO GET INTO THE AIR SO ATC WOULDN'T BE WONDER WHERE WE WERE; WE BEGAN OUR TKOF ROLL. SOON AFTER LIFTOFF; WE HEARD ANOTHER ACFT ANNOUNCE TURNING FINAL FOR RWY 36! WE HAD NO CHOICE BUT TO CONTINUE OUR CLB; BUT AFTER VISUAL CONTACT WITH THE OTHER ACFT; I VEERED R TO AVOID HIM. I ALSO HEARD ANOTHER ACFT ANNOUNCE TURNING BASE FOR RWY 36 AT THAT TIME. (TFC PATTERN IS R TURNS FOR RWY 26; SO MY TURNING R TO AVOID THE TFC ON BASE WAS THE MOST APPROPRIATE WAY TO GO.) I LEARNED THAT YOU MUST MONITOR CTAF TO GET A GOOD MENTAL PICTURE OF WHAT'S GOING ON AROUND YOU. IF WE HAD BEEN LISTENING TO CTAF WHILE WE WERE GETTING OUR CLRNC; WE WOULD HAVE KNOWN THERE WAS TFC IN THE PATTERN FOR RWY 36. ALSO; EVEN THOUGH WE FELT PRESSURE TO GET INTO THE AIR; WE SHOULD HAVE SLOWED DOWN. IF WE COULDN'T GET INTO THE AIR IN AN EXPEDITIOUS MANNER; WE COULD HAVE CALLED ATC BACK TO LET THEM KNOW. FINALLY; WE LEARNED THAT AT AN UNCTLED ARPT; YOU MUST LOOK IN EVERY DIRECTION. AT AN UNCTLED ARPT ALL RWYS CAN BE CONSIDERED ACTIVE.