The overall idea with each Person Status is that it corresponds to your person lifecycle (set in Admin). It shows how people move from first enquiry as an unknown user through to a customer, and potentially even a repeat customer.
So your lifecycle might go something like this:
1. Unknown
2. Marketing Suspended / Unsubscribed
3. MQL
4. SQL
5. Customer
Therefore you would mark anyone who filled in your form and was an unknown person as step 2 using "Change Person Status", and then change them to 3 if they confirmed. And only send to people who are Person Status 3,4 or 5 ongoing.
This would assume that only people who are subscribed can be MQLs, and you would also need to think about how you handle people who are customers who unsubscribed. I'm not convinced this is the best way to manage your overall person lifecycle, but there are others who are much better at this who could probably weigh in - it's a big topic! It is a possible solution though.
Overall if you only send to people who have a date in the confirmation date field you've set up, that would take care of it. Just make sure you clear that field out if they unsubscribe.
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