Howdy Anne-Marie,
I am happy to help you get some answers. What you want is pretty unique. By default the EDD Tickets plugin simply adds a product (The ticket) to EDD, and makes it easy for a user to add that ticket to their cart when they view the event. It is a great way to sell simple tickets, and works awesome even for multiday events.
However, when you have a lot of options that would affect the final price of the ticket, it gets complicated. Most shopping carts, Easy Digital Downloads included, expect these to be add-on products. So a user would add the ticket to their cart, then they might add some additional items as well. It is not really a form though, where when a user checks out they are asked questions and then additonal products are added based on their answer. These are simply additional products that would be available for purchase before checking out. If you want a form setup, you would likely have to develop that yourself as I am not aware of any shopping cart, Easy Digital Downloads or otherwise, that is setup like that.
Does that make sense? do you have any more questions? Please let me know. Cheers!
– Brook