F100 CREW WAS GIVEN NON STANDARD CTLR INSTRUCTIONS AFTER BAD VECTOR TURN ON AT DAL.

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ALIGNMENT WITH WRONG RWY. FO WAS FLYING. ON A R BASE LEG FOR RWY 31R DAL; FO AND I BOTH HAD A GENERAL IDEA WHERE THE ARPT WAS. WE WERE ASKED SEVERAL TIMES BY APCH IF WE HAD THE ARPT AND I HAD DECLINED ACCEPTING A VISUAL APCH DUE TO THE NUMEROUS LIGHTS IN THE AREA AND BECAUSE OF HAVING A NEW FO THAT WAS UNFAMILIAR. WE RECEIVED A LATE TURN ONTO FINAL PROBABLY BECAUSE ATC PLANNED ON US TAKING A VISUAL APCH. THIS ALSO LEFT US HIGHER THAN NORMAL. WE GOT CLRNC FOR APCH RWY 31R AND FO BEGAN TURN TO JOIN RWY 31R LOC. AS WINGS ROLLED LEVEL; WE WERE UNKNOWINGLY LINED UP PERFECTLY WITH RWY 31L VISUALLY. BEING DISTR BY A NEW FO AND OFFERING GUIDANCE TO BEGIN DSCNT; I ALLOWED MY SCAN OF LOC TO BE OMITTED. AS DSCNT BEGAN; I THEN REALIZED THAT APCH HAD NOT SWITCHED US TO TWR; SO I ASKED APCH TO SWITCH US OVER AND HIS REPLY WAS THAT WE WERE LINED UP WITH RWY 31L NOT RWY 31R; AND TO JUST LAND ON RWY 31L. UNSURE OF THIS CLRNC BY APCH NORMALLY GIVEN BY THE TWR; I TOLD APCH THAT WE WOULD GO AROUND BECAUSE I FEARED A CONFLICT WITH OTHER POSSIBLE TFC. APCH THEN STATED 'YOU ARE CLRED TO LAND RWY 31L.' WITH THAT; WE DECIDED TO CONTINUE FOR RWY 31L VERSUS A GAR OR A TURN BACK TO RWY 31R. I SWITCHED TO TWR FREQ AFTER LNDG AND THE TWR CTLR HAD KNOWN OF THE CLRNC OR HAD RELAYED IT TO APCH FOR US. IN EITHER CASE; THERE WAS NO CONFLICT. CONTRIBUTING FACTORS: NEW FO NOT FAMILIAR; APCH CLRNC GIVEN ABOVE GS AND FO SLOW TO RESPOND DISTRACTING ME; LATE TURN TO FINAL WITH TAILWIND ON BASE LEG; AND MY FAILURE TO SCAN LOC.