inventory and invoicing management - open to bidding

i need software for inventory ,sales and invoicing management both online and offline We sell mobile phones , laptops , desktops and accessories like chargers , cases , batteries , LCD, headphones ,power banks etc . Need a software that will show product descrition with pictures and quantities left at all times both in main store and showroom . Also the printing of sales receipts cash , Cheque ,bank transfer and credit , invoices with or without VAT , Proforma invoice with or without VAT Also the delivery of goods by LPO for companies which order goods and issue a local purchase order, collect the goods ,sign a delivery note and pay later .Need a complete system management which is user friendly We have main store and showroom .Some products have 2 pcs ,3 pcs or more in showroom. we