Prestashop Modification

I need below tweaks in prestashop framework 1.6 1. While creating a new EMPLOYEE, I want 2 new fields City(drop-down) and Areas (multi-select auto-fill drop-down) (see attachment). Save this information for future use in the database. 2. While creating new CUSTOMER, I want a new auto-fill drop-down field Area based on City(see attachment). Also make the City field as auto-fill drop-down. Save this information for future use in the database. Please let me know what will be the fees and time to complete this. My budget is $30.