Develop webservices

hi I want to convert the web based PHP business directory script(ApPHP Business Directory- [login to view URL]) into web services with ADMIN BACKEND to monitor the android app and compatible to latest android OS to be useful for android app. This [login to view URL] script is already installed on my domain - [login to view URL] for reference. Admin Login URL: [login to view URL] Customer Login: [login to view URL] Admin Side ========== Explaining below what to be converted?: 1. General -> Settings a) UTC time zone b) Email settings-> PHP Mail Function and SMTP c) Location -> add Country->State->City->Area 2. Accounts a) Personal Information - First Name, Last Name, E-mail address b) Change your password - Password, Retype Password c) Customers -> Add New -> Personal Info -> First name, Last name, Birth Date, URL -> Billing Address -> Company,Address,Address (line 2),City, Zip/Postal code, Country,State -> Contact Information -> Phone, E-mail address -> Account Details -> Username, Password -> Other -> Email notification, Active, Comments 3. Listings Management a) Location -> add Country->State->City->Area b) Categories -> add new category and add new sub-category c) Listings -> Create New -> Advertise Plan -> Location(Country->State->City->Area) -> Sub Location -> Website URL -> E-mail address -> Phone -> Published -> Name of listing(title) -> Description -> Image 4. Payments a) Advertise Plans -> Free, Bronze, Silver, Gold b) Orders 5. Mass Mail & Templates a) Email Templates b) Mass Mail Customer Side ============== Dashboard Links ->Edit My Account ->My Listings ->Advertise ->My Orders ->Inquiries Edit My Account -> Personal Details -> Billing Address -> Contact Information -> Account Details My Listings -> My listings+details -> Add New+Choose plan Advertise -> Choose Plan My Orders -> List orders Inquiries -> Show inquiries -> Reply to inquiries