NEW TO THE CARPET CLEANING BUSINESS!

HEY GUYS, IM JUST GETTING STARTED IN THE CARPET CLEANING BUSINESS, AND JUST WONDERING WHAT EVERYONE IS CHARGING. DO YOU CHARGE BY ROOM OR BY SQ FT? WHEN A CUSTOMER CALLS, I WOULD LIKE TO GIVE THEM A QUOTE OVER THE PHONE, IS THIS POSSIBLE WITHOUT SEEING THE CARPET? I FEEL I CAN GUARENTEE A JOB WITH A QUOTE OVER THE PHONE, RATHER THAN MAKING A SEPERATE APPOINTMENT TO GO LOOK AT THE CARPET AND GIVING THE CUSTOMER THE CHANGE TO CALL BACK AND CANCEL BECUASE THEY GOT A QIUCK QUOTE OVER THE PHONE FROM SOMEONE ELSE.