RWY INCURSION BY A LOW TIME C172 PVT PLT; RWY 2L AT PDK; GA.

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I FLEW TO PDK NEAR ATLANTA; GA. I NEEDED SOME CURRENT SECTIONAL MAPS AND WANTED THE EXPERIENCE OF FLYING INTO A BUSY ARPT. IT IS A SHORT FLT FROM MY HOME ARPT 9A1 TO PDK; SO I DID NOT FILE A FLT PLAN. I DID HAVE ALL THE INFO NEEDED TO CONTACT THE TWR AND AN ARPT DIAGRAM OF THE RWYS. I LANDED ON RWY 2L AND TAXIED TO THE FBO RAMP. AFTER I PURCHASED MY SUPPLIES FROM THE LCL PLT SHOP; I CONTACTED GND CTL. GND CTL CLRED ME TO TAXI TO RWY 2L. AT THE INTXN OF RAMP B AND RAMP A; I GOT CONFUSED. I ADVISED GND CTL THAT I WAS UNFAMILIAR AND THEY GOT ME HEADED TO RWY 2L BY FOLLOWING ANOTHER ACFT. GND CTL SENT ME TO THE RUN-UP AREA AND ADVISED TO CONTACT THEM BACK AFTER I FINISHED MY RUN-UP AND WAS READY TO DEPART. I CONTACTED GND CTL AND WAS GIVEN APPROVAL TO TAXI TO RWY 2L. I CANNOT REMEMBER THE FULL INSTRUCTIONS GIVEN; BUT I STARTED TO THE AREA WHERE THE ACFT I WAS FOLLOWING WAS SITTING. MY ACTION PUT ME ONTO RWY 2L AND I MISSED THE HOLD MARK. THE OTHER ACFT WAS HOLDING FOR RWY 2R BUT I THOUGHT I HAD TO TAXI TO IT TO GET TO RWY 2L. TWR CALLED AND ADVISED THAT I HAD MISSED HIS INSTRUCTION AND SHOULD NOT BE SITTING ON THE RWY 2L. I AGREED AND ADVISED TWR I MISUNDERSTOOD MY INSTRUCTION FROM GND AND WAS NOT USED TO SUCH A BUSY ARPT LIKE PDK. TWR WAS NICE AND ADVISED FOR ME TO BE CAREFUL IN THE FUTURE AND CLRED ME TO DEPART. AFTER RETURNING TO MY HOME BASE; I CONTACTED THE INSTRUCTOR THAT TRAINED ME AND TOLD HIM WHAT I HAD DONE. THE INSTRUCTOR REVIEWED WITH ME THE RULES; RWY MARKINGS; TERMINOLOGY OF GND CTL; AND ADVISED THAT I FILL OUT THIS FORM TO DESCRIBE WHAT HAPPENED FOR THE RECORD. I UNDERESTIMATED THE COMPLEX TAXI RAMPS OF PDK. I HAD THE RWY DIAGRAMS; SO WHEN I WAS CLRED TO LAND I COULD VISUALIZE WHICH RWY WAS WHICH. PDK HAS 8 DIFFERENT LNDG OPTIONS. I ALSO USED THE WORD TO GND CTL THAT I WAS UNFAMILIAR. I SHOULD HAVE SAID THAT I NEEDED A PROGRESSIVE TAXI. I DID NOT REALIZE HOW CLOSE THE RUN-UP AREA WAS TO THE END OF RWY 2L. IN MY PLANS TO GO TO PDK ON THIS DATE; I ONLY HAD THE DIAGRAM THAT SHOWED THE RWYS. IN THE FUTURE; I WILL HAVE THE BETTER DIAGRAM WITH TXWYS AND BE ALERT TO RWY XINGS.