PLT OF BE30; UNABLE TO CONTACT TPA TRACON AFTER TWR CLOSURE; TAKES OFF FROM SPG AND ENTERS TPA CLASS B WITHOUT CLRNC.

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I WAS TO DEPART ST PETERSBURG (SPG) AT XA30. HOWEVER; DUE TO LATE PAX; I WAS INFORMED THE DEP TIME WOULD NOW BE XC15. THE WHITTED CTL TWR CLOSES AT XC00. BEING NEW TO THIS ARPT; I FIRST ASKED THE LCL FBO MGR; WHO WAS ALSO A LCL PLT; WHAT PROCS ARE THE NORM FOR DEPARTING AFTER THE TWR CLOSES. HE INFORMED ME TAMPA DEP WANTS A DEP ON A 270 DEG HDG AND REMAIN BELOW 2500 FT MSL. I THEN POINTED OUT THAT WOULD BE IN TAMPA'S CLASS B AIRSPACE. HE STATED THE ARPT HAS AN AGREEMENT WITH TAMPA DEP THAT PLTS WOULD DEPART AS STATED 270 DEGS AND STAY BELOW 2500 FT MSL. NOT TOTALLY AGREEING WITH HIM; I CALLED THE GND CT. ON 121.8 AND ASKED THE CTLR WHAT PROCS SHOULD I FOLLOW; AND MENTIONED WHAT THE LCL FBO STATED. THE CTLR STATED ONCE THE TWR CLOSED; I WOULD BE ABLE TO TALK WITH ST PETERSBURG FSS ON THE GND USING 121.8 AND THEY WOULD BE ABLE TO GIVE ME MY CLRNC. I CALLED FSS FOR OVER 10 MINS WITH NO RESPONSE. I ALSO ATTEMPTED TO CALL ON ANOTHER FREQ WITH NO LUCK. AFTER MANY ATTEMPTS TO REACH FSS; I DECIDED TO TAKE OFF AND CALL TAMPA ASAP ON THE 2 FREQS LISTED ON MY APCH PLATE. AFTER DEP; I STARTED CALLING TAMPA 30 SECONDS OF BECOMING AIRBORNE. AFTER MANY ATTEMPTS (15-20); A CTLR STATED THE PERSON CALLING TO SWITCH TO ANOTHER FREQ; WHICH I DID. TAMPA DEP THEN TOLD ME I WAS IN CLASS B AIRSPACE AT 2000 FT AND I SHOULD DSND TO 1100 FT; WHICH I DID. AFTER SEVERAL MINS; I WAS GIVEN MY CLRNC TO DEST. THE NEW FREQ IS NOT LISTED ON ANY OF MY COMMERCIAL PLATES. I'M FULLY AWARE AS PIC; IT'S MY RESPONSIBILITY TO STAY CLR OF CLASS B AIRSPACE. NEVER IN MY 13000+ HRS HAVE I BROKEN THIS RULE. HOWEVER; I FEEL MANY FACTORS HELP ME MAKE THIS MISTAKE. WRONG INFO FROM A LCL PLT AND GND CTL; UNLESS FSS JUST DID NOT ANSWER ME. ATTEMPTING TO CALL TAMPA ON A FREQ LIST; BUT NOT MONITORED BY THE DEP CTLR. AND FLYING OUT OF AN ARPT I WAS NOT FAMILIAR WITH. NONE VERY GOOD EXCUSES; JUST SOME DUMB MISTAKES. MANY IMPORTANT LESSONS WERE LEARNED ON THIS ONE FLT.