Do the sign up forms appear as pop ups to collect emails?

Hi please refer to the numbered points

1. I would like one of the sign up forms to appear as a pop up. How do I set up a pop up compared to a standard optin form on my website?

I would like the pop up to offer a £50 discount code in exchange for their email. 

And I would like another signup form to offer free tips and product promotions as part of a newsletter. 

2. Where does the standard newsletter optin form go on my website?

3. Does the newsletter email sign up form need to be separate from the popup form offering the discount, and if so, do I need 2 separate sign up forms on the website, one for the pop up discount form and the other for the email newsletter?

4. Should the pop up form be linked to a flow, and the newsletter sign up offering free tips and promotions form be linked to a campaign?

Thank you.