Push button to add new row of data using data forms

I am writing an excel workbook to keep track of a local festival's finances. This workbook is used for logging all invoices and expenses.

What I would like to do is set up a table or list of all invoices etc. Rather than an empty table below which doesn't look good, I'd like to insert a button labeled 'Add new item' which once pressed will create a new row underneath the headings, and then a new row under that and so on, rather than filling in the cells manually. I'd also like a dialogue box to appear once the 'add new item' button is clicked with boxes for date, who to, paid etc etc so that the recently added row is completed automatically. This is a bit like data forms, only it is intended for novice users so I'd like it if it was macro driven so that the user doesn't have to play around with the excel ribbon.

If anyone can solve my query it would sure help out a lot.