C182 PLT ENTERS CLASS B AIRSPACE.

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VFR DEP FROM VGT ON AUG/FRI/02 ABOUT XA00. UNFAMILIAR WITH ARPT; REQUESTED PROGRESSIVE TAXI FOR VFR DEP TO THE W. TAXIED TO RWY 12. NO VFR CLRNC FROM GND CTL DURING TAXI; ASSUMED DIRECTIONAL INSTRUCTIONS WOULD BE GIVEN AFTER TKOF. RPTED READY FOR TKOF ON VFR TO PALMDALE DEP; HELD FOR LNDG TFC ON RWY 12R. DEP RWY CHANGED TO RWY 7. TAXIED TO RWY 7 BY XING RWYS 12. HELD BRIEFLY AT RWY 7 TO CONSIDER DEP PLAN. REQUESTED BY TWR TO EXPEDITE FOR TFC ON FINAL. DEP PLAN INTENDED WAS TO MAKE 'R DOWNWIND' FROM RWY 7 TO AVOID CLASS B TO S AND E; APCH TFC TO RWY 12 FROM NW. DUE TO EXPEDITING; UNABLE TO COMMUNICATE TO VERY BUSY TWR. AFTER TKOF; AT ABOUT 1200 FT AGL; REQUESTED EITHER A R TURN OR HDOF TO DEP DUE TO INCIPIENT CLASS B INCURSION ON 070 DEG HDG. REQUEST MOTIVATED BY R TURN BEING AN 'UNUSUAL MANEUVER' IN THE TFC PATTERN. R TURN APPROVED BY TWR; BUT INSTRUCTED TO TURN TO 270 DEGS (TO AVOID CLASS B TO THE S IS ASSUMED). MAINTAINED 270 DEGS AND CLB WHILE SCANNING FOR TFC. RPTED 2 ACFT AS NON FACTORS. ACFT #1; A TWIN JET; AT 1 O'CLOCK POS; BELOW; ON APCH COURSE (AT 2-3 MI ESTIMATED). ACFT #2; A PISTON TWIN; BELOW; AT 11 O'CLOCK POS; MOVING AWAY. SHORTLY THEREAFTER; TWR RPTED I WAS ABOVE CLASS B FLOOR (4500 FT MSL). I WAS AT 5300 FT; AND SHOULD DSND IMMEDIATELY. COMPLIED AND COMMUNICATED DSCNT; REACHED 4500 FT MSL. TWR INSTRUCTED ME TO CALL A PHONE NUMBER AFTER MY SAFE ARR. AFTER ARRIVING AT MY DEST; MADE THAT CALL. FACTORS INVOLVED: 1) INVALID ASSUMPTION -- THAT IF GND CTL DID NOT GIVE ME A VFR CLRNC; I WOULD GET HDGS APPROVED/DENIED WHEN I REQUESTED TO FIT INTO TFC FLOW; IE; R TURN ACROSS RWY 12 DEP COURSE. I THOUGHT THAT IF TWR WANTED A L TURN; THEY WOULD SO INSTRUCT. 2) WESTERLY CLB WAS INTENDED TO STAY UNDER CLASS B AIRSPACE; BUT ABOVE TFC AT/ABOUT PATTERN LEVEL. THIS AMOUNTS TO 2500-800 FT PATTERN ALT -500 FT SAFETY FACTOR)= 1200 FT OVER 5 MI OR ABOUT 250 FPM. 3) DURING SEE AND AVOID DEP; FAILED TO MONITOR CLB RATE DUE TO TFC AND TWR COMS. REACHED ALT 800 FT ABOVE CLASS B FLOOR 1-2 MI FROM OUTER CLASS B BORDER. 4) THE BEST PRACTICE WOULD BE TO DISCUSS THIS WITH TWR PERSONNEL FROM PLT'S PLANNING ROOM BEFORE GETTING INTO THE AIRPLANE. THE BEST PLANNING IS DONE IN A 'ZERO-ZERO' ENVIRONMENT; ZERO KTS; ZERO AGL.