A C340 PLT EXPERIENCES 2 POTENTIAL TFC CONFLICTS WHEN HE FAILS TO FOLLOW THE 2 CLRNCS AS ISSUED FOR LNDG ON RWY 21 AT SDL; AZ.

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I HAD SPENT THE LAST 2 DAYS IN KINGMAN; AR; TRAINING AND TAKING MY SINGLE ENG COMMERCIAL CHK RIDE. AFTER A SUCCESSFUL CHK RIDE; THE WX IN KINGMAN DETERIORATED RAPIDLY TO IFR. AFTER CHKING THE WX; I FILED AN IFR FLT PLAN TO SCOTTSDALE. I DID NOT THINK I WAS TOO TIRED TO FLY; HOWEVER; UNTIL AFTER TKOF. UPON TKOF; I WAS IMC IMMEDIATELY. THE AUTOPLT WOULD NOT ENGAGE AND I FLEW THE RTE MANUALLY. THE FLT WENT WITHOUT INCIDENT AND I WAS PASSED OFF TO SCOTTSDALE TWR FOR A VISUAL APCH. I HAD ALREADY PICKED UP THE LATEST ATIS AND KNEW THE WX WAS VFR AND THEY WERE USING RWY 21. UPON CONTACTING THE TWR; I WAS CLRED FOR THE VISUAL TO RWY 21 AND TOLD TO PROCEED TO THE 'NUMBERS.' THERE WAS 1 OTHER PLANE ENTERING DOWNWIND WHO HAD ME INSIGHT. I WAS STILL LOOKING FOR HIM. FOR SOME REASON; I INVERTED THE RWY AND ENTERED A L DOWNWIND TO RWY 3. JUST AS I ENTERED THE DOWNWIND; I LOOKED AT THE RWY AND SAW THE NUMBERS. I REALIZED MY MISTAKE. JUST AS I WAS CALLING THE TWR; THE DOWNWIND TFC PASSED ME ON MY R; SAME ALT; MAYBE 1000 FT FROM ME. AT THAT SAME TIME; THE TWR CALLED AND ASKED ME WHAT I WAS DOING; AND INSTRUCTED ME TO TURN L OVER THE RWY AND ENTER A L DOWNWIND FOR RWY 21. I WAS TOLD I WAS TO LAND BEHIND A CHALLENGER. AS I WAS STARTING TO TURN L BASE; THE TWR ASKED IF I HAD THE CHALLENGER IN SIGHT. I TOLD THEM I HAD AN ACFT ON SHORT FINAL. THIS WAS NOT THE CHALLENGER. IT WAS JUST STARTING A LONG FINAL 1/2 MI AHEAD OF ME. THE TWR TOLD ME TO STOP MY BASE TURN AND FOLLOW THE CHALLENGER; WHICH I DID. AFTER REVIEWING THE INCIDENT; I REALIZE I WAS MUCH TOO TIRED TO FLY. AFTER NOT SLEEPING WELL THE NIGHT BEFORE; AN EARLY MORNING TRAINING FLT; FOLLOWED BY A CHK RIDE; THEN HAVING TO HAND FLY AN IMC FLT TO SCOTTSDALE; IT WAS EASY TO MAKE A MISTAKE. IN THE FUTURE; I WILL BE RESTED ENOUGH TO HANDLE INFLT DIFFICULTIES AND STILL LAND SAFELY.