A C172 PLT FLYING A TFC WATCH MISSION ENTERED THE TFC PATTERN OF E14 IMPROPERLY; BUT CORRECTED WHEN ADVISED BY ANOTHER ACFT.

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FLYING LOCALLY IN THE TUCSON AREA UNDER VFR; I HAD TO MAKE AN UNSCHEDULED LNDG AT AVRA VALLEY ARPT. I HAD A CURRENT VFR SECTIONAL AND OBTAINED THE ARPT UNICOM FREQ FROM THIS. I WAS N OF THE FIELD AT 6500 FT. I CALLED UNICOM AND REQUESTED ARPT ADVISORIES. AFTER SEVERAL ATTEMPTS WITH NO SUCCESS; I HEARD AN ACFT ADVISE HE WAS LNDG RWY 30 AT AVRA VALLEY. I PROCEEDED SBOUND AND BEGAN TO DSND. I ADVISED TFC OF MY INTENTIONS TO CROSS OVER MID-FIELD AT 4000 FT AND ENTER L TFC FOR RWY 30. AS I BEGAN MY DSCNT AN ACFT ADVISED HE WAS DEPARTING RWY 30 TO THE NE. I RESTATED MY INTENTIONS AND ADVISED I WOULD WATCH FOR HIM. HE ACKNOWLEDGED. WE SPOTTED EACH OTHER N OF THE FIELD AND CALLED EACH OTHER IN SIGHT. APCHING 4000 FT AT MID-FIELD I ADVISED TFC AGAIN OF MY INTENTIONS TO ENTER L TFC FOR RWY 30. IT WASN'T UNTIL I HAD BEGUN TO ENTER L DOWNWIND TFC THAT AN ACFT ASKED IF I WAS FAMILIAR WITH THE ARPT. I ADVISED THAT I WAS NOT. HE THEN ADVISED ME OF LCL PARACHUTE JUMPING IN PROGRESS ON THE W SIDE OF THE ARPT. HE ALSO ADVISED THAT DUE TO LCL PARACHUTE JUMPING ON THE W SIDE OF THE ARPT RWY 30 USED R TFC. I TOOK EVASIVE ACTION AND MADE AN IMMEDIATE R TURN BACK OVER MID-FIELD TO ENTER R TFC FOR RWY 30. I ALSO ADVISED TFC OF MY INTENTIONS. I BELIEVE THIS SIT COULD HAVE BEEN PREVENTED THROUGH SEVERAL COURSES OF ACTION: I SHOULD HAVE CARRIED A CURRENT ARPT FACILITY DIRECTORY. UNICOM SHOULD BE MONITORED MORE CLOSELY DURING PARACHUTE JUMPING. OTHER ACFT COULD HAVE CORRECTED ME SOONER WHEN THEY HEARD THE ERROR OF MY INTENTIONS.