7333 Joomla Add On's

We run a basic auction on our website. We need to add 4 fields on the bidding page. We need to add fields in the auction named time remaining face value Asking Price Minimum Bid Messages These changes will have to be input in the admin interface. We also need to add a link for download of a contract on main auction summary page. The contract will need to be uploaded from admin end and user will download via a link into a pdf. Thanks