I have to do this project and i'm finding it so hard its way over my head if any one has any ideas or help. What would the best way to do this ?

small application to keep track of enquiries. When an enquiry comes in by phone or in person, she needs to record their name, address, contact phone number, nature and date of the enquiry, and the name of the salesperson she passes it on to. When making follow up calls she needs to be able to list enquiries sorted by date (ascending or descending) depending if they have be followed up and/or purchased.

You will need to store the data in a local binary or XML file. As a good Java programmer you will use correct Object-Oriented techniques e.g using an Interface named 'DataStore' to access all data in case the implementation needs to change later on (perhaps they might decide to store the data in an existing database).