Q1: It depends on what you mean by linking them. Pipedrive offers an API, so in theory almost everything is doable. By reading Q2 I guess you want to use a form to send data into Pipedrive or something similar. In that case I would suggest looking into Elementor Pro’s documentation to see how you could do that. There might be a bit of coding necessary to make the two talk.
Q2: You can definitely use your current account. I think you could also try requesting one for testing.