Backbone.js Multi-Step Form

I'm looking to make a step by step form for an "instant quote" type of thing on my website. I made the following image on photoshop, it's pretty self-explanatory that I want the user to enter information at each step of the form and ultimately submit the form at step 3 (going to the next step should be seamless, without a page reload).

Can someone please give me some general pointers how I should go about this? This is my first project using backbone.js and it would really help to have a high level overview of whats the best way to approach this particular widget.

Thanks