How to pass data to mailchimp based on conditional logic?

Secondly I have integrated mailchimp into the form, how does this work as i have added a checkbox asking if they want to be contacted.

Do they have to submit the form data for us to get the email address.

Ideally we only want one action that submits and prints at the same time wso can we just have a print button which does both actions?

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You can send email or data to your mail chimp based on the conditional logic. Please refer to the guide below.

Guide: How-to-Use-MailChimp-Tags

And yes, they need to submit the form so you can receive their responses.

Ideally, we only want one action that submits and prints at the same time so can we just have a print button which does both actions?

Unfortunately, submit button is for submitting forms only, and the print button is for printing option so it's not possible to trigger both at the same time.