Sell/Buy portal

%3cspan style%3d%22font-size%3a 13px%3b%22%3e %3cp%3eI want to build a portal for posting advertisement where sellers and buyers can meet.%3c/p%3e %3cp%3ePlease have a look at olx.com.pk. The idea is similar but simple and interesting outlook is needed.%3c/p%3e %3cp%3eMain use cases are the following%3a%3c/p%3e %3cspan style%3d%22text-decoration%3a underline%3b%22%3e %3cp%3eEnd-User Use Cases%3a%3c/p%3e %3c/span%3e %3cp%3e1. End User creates advertisement with product category %28pre-defined%29%2c product information%2c price%2c contact number%2c email%2c address%2c city and photos of the product.%3c/p%3e %3cp%3e2. End User removes the advertisement.%3c/p%3e %3cp%3e3. End User modifies the already posted advertisement.%3c/p%3e %3cp%3eWhen posting the advertisement first time or changing it%2c end-user shall be asked to pay the fee.%3c/p%3e %3cp%3eIf Administrator rejects the advertisement first time%2c this will not require the user to pay the fee.%3c/p%3e %3cspan style%3d%22text-decoration%3a underline%3b%22%3e %3cp%3eAdministrator Use Cases%3a%3c/p%3e %3c/span%3e %3cp%3eAdministrator can create categories for allowed products.%3c/p%3e %3cp%3eAdministrator can remove advertisements.%3c/p%3e %3cp%3eAdministrator can approve advertisements.%3c/p%3e %3cp%3eAdministrator can reject the application for advertisement. This shall generate email towards end-user with a link that takes to the form to modify the advertisement.%3c/p%3e %3cp%3eAdministrator can configure the cost for posting the advertisement per category.%3c/p%3e %3cp %3e%3cspan style%3d%22text-decoration%3a underline%3b%22%3eSuper Administrator Use Cases%3a %3cp%3e%26nbsp%3b%3c/p%3e %3c/span%3e%3c/p%3e %3cp%3e%26nbsp%3b%3c/p%3e %3cp%3eSuper Admin shall be able to create the Administrators.%3c/p%3e %3cp%3eSuper Admin shall be able to disable/remove the Administrators.%3c/p%3e %3cp%3ePlease propose the following alongwith the bid.%3c/p%3e %3cp%3e1. Mockup screens.%3c/p%3e %3cp%3e2. Technology you are going to use.%3c/p%3e %3cp%3e3. Testing procedure you will use.%3c/p%3e %3cp%3e4. Requirements for hosting.%3c/p%3e %3cp%3e %3c/p%3e %3cspan style%3d%22text-decoration%3a underline%3b%22%3e %3cp%3e %3c/p%3e %3c/span%3e%3c/span%3e