Limited ecommerce site

I need to develop a Simple Website with limited access to those people that we will authorize. Those people will be able to choose phone models that I'll be actualizing on a daily basis. The customers should have a shopping cart and the payment must be only by credit card or PAYPAL. If someone wants to pay in cash in my store, the only me can authorize the transaction. At the end of the day, the system must produce an output report in order to send it to our main supplier's system. Every Phone model will have the most important features in a table so the customers can compare with other models. At the beggining we are going to have no more than 10 models (we are starting a business here). The input file for the available balances will be provided by our supplier. Please, I need a very easy maintenance screen. All kinds of reports or statistics are welcome.