How to: copy data from sheet 1 to 2 after hitting a submit button?

I've got a file attached of the kind of thing I'm after.... two sheets: data from the first should transfer to the second when the user presses the SUBMIT button, so the second sheet is all plain data with each new entry coming in beneath the previous row. If (hopefully, when) this one is up and running I'd like to add a few other fields too.

The highlighted fields should have drop down menus, with options as described. The date should be in a specific format, say DD/MM/YYYY - the format must be the same for each entry - can it be set to DD/MM/YYYY so if someone enters the date in another format (e.g. 4 April 12) it will convert it? Or is it easier to have a calendar pop-up so you can just mouse click the date?

Once all fields are full, the user will click the SUBMIT button and all the entries should go the the second sheet.

How do I do this??? I'm sure it's not the most complicated thing you could hear of but it's certainly well over my head, I don't know where to start. Please help !!

Will