FLT CREW OF A319 FAILED TO HOLD SHORT OF TXWY 'AM' AT CYYZ DUE TO LACK OF OR POOR SIGNAGE.

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INITIAL TAXI INSTRUCTIONS WERE TO HOLD SHORT AT TXWY AM. AS WE TAXIED OUT WE WERE NOTING THE TXWY SIGNAGE TO TRACK OUR PROGRESS TOWARDS TXWY AM SINCE WE WERE BOTH UNFAMILIAR WITH CYYZ ARPT. NEVER SAW ANY SIGNAGE OR PAINT MARKINGS FOR TXWY AM. AS WE SPOTTED THE NEXT SIGN (AL) GND CTL ASKED US TO SLOW AND STOP SINCE WE HAD MISSED TXWY AM AND HE WOULD NEED TO COORDINATE WITH THE APRON. THERE WERE NO OTHER ACFT IN THE AREA AND GND CLRED US OUT AL AND CONTINUED TO RWY 23. AT RWY 23 WE COULD ENTER THE RWY AT TXWY H OR FULL LENGTH FROM TXWY Q. WE SETUP FOR TXWY Q AND THAT APPEARED TO CAUSE THE TWR SOME CONCERN. FOR SOME REASON CYYZ HAD US TAXI COMPLETELY AROUND THE ARPT. DUE TO CONSTRUCTION THEY HAVE NOT MARKED TXWY AM WHERE WE COULD IDENTIFY IT PROPERLY. THEN OUR COMPANY INFO DOES NOT INDICATE ANY PROB WITH USING TXWY Q FOR RWY 23 DEPS. OUR COMPANY PERFORMANCE DOES NOT INDICATE IF THE RWY 23 DATA IS FROM TXWY Q OR TXWY H. IF TXWY AM IS IDENTED IT IS DONE SO POORLY THAT IT IS A SAFETY HAZARD.