[Plugin: Contact Form 7] on_sent_ok help & data passing data to another form

Hello everyone, hopefully this is straightforward enough to answer..

If you check out cheesin.org/melivingwp you can see that the front page (form1) has a 3 fields to fill out, once you click the submit button, it’s supposed to take you to the Sign up! page (form2) where it pre fills those three fields for you.

I have read about the dynamic text extension plugin and adding a dynamic field that can populate the information from form1. I understand that this adds another text box to my original form, BUT will this matter if a user decides to skip form1 and go right ahead to form2? I haven’t actually gotten this working yet so just looking for any problems I may encounter.

Now as for on_sent_ok, I found something that looks like this:
on_sent_ok: "location = '/my-second-form?phone='+jQuery('#phone').val()+'&first-name='+jQuery('#fname').val()+'&last-name='+jQuery('#lname').val()+'&email='+jQuery('#email').val();"

but the /mysecondform? is confusing me, what would I put there instead? /sign-up? or the actual name of the form?

Thanks alot,
Peter