build me an easy WEB Application

Web App. Project Summary system also will provide middle business persons an easy way to generate and manages variety of reports also. Following features will be needed: User Registration/login (with E-mail) User Update Profile Business details Add/Edit/Delete/List Customer (Name, Phone#, Address, Email, Starting Balance) Add/Edit/Delete/List Vendor (Name, Phone#, Address, Email, Starting Balance) Add/Edit/Delete/List Items (Item Code, Item Code, Open Quantity, Purchase Price, Sales Price) Add/Edit/Delete/List TAX (TAX Code, TAX Percentage, Tax Name) If tax is enable then Tax(es) will calculate automatically end of the total of each and every invoice. Create Estimate Create Sale Create Sale Returns Create Purchase Order Create Purchases Create Purchase Returns Create Receipts Create Payments Create Expense Reports Settings Invoice Sequence Date Format Enable Tax List (Tax name & %) Choose Currency (A list of currency) Printer Setup Create Backup