ADD few more modules in the existing PHB / XAMMP application -- 2

The existing PHB application is running on Xampp. The following to be added in the existing application. 1. Upon generation of invoice, the invoice is to be emailed to the customer. 2. VAT to be is automatically calculated already for the particular period, however spread sheet is to be made for all the list of invoices and expenses covered in the VAT for the particular period. 3. Able to extract invoices in Zip file by selecting the invoices "From" and "To". The existing coding files will be shared for making additions.