Can I create a form and require a box to agree to terms and then have an electronic signature?

There are a few different ways to add terms and conditions to your form.  Here is our guide on how to set those options up:

https://www.jotform.com/help/76-Adding-a-license-agreement-to-a-form

We offer a few signature widgets that will allow for your users to sign electronically directly in the form:

http://widgets.jotform.com/search/signature

Depending on your needs, one may work better than another.