How can i send Email in Flow?

Hi All,

Hope you are having a good day!

1. How can i send Emails in a Flow.

2. How to create Sign Up Forms and Thank you pages:

• Is there any Scripting language for importing data from sign-up forms into Klaviyo and displaying customer attribute values in email templates.
•  And here, only standard forms available and is there any way to create Customized Sign-Up Forms and Thank you page.

3. Where i can set up the sender profile and delivery profile

Can you please address.

Thanks a million,
Ganesh