Best way to integrate email marketing/CRM system ?

Hello there,

Probably this is beyond the scope of generatepress forum, so consider this topic as i am just looking for general recommendations.

I am setting up a blog which will have some articles and courses.

Now i want to put up paywall and ask people to register to read the articles. And even pay for some of them

Do you have any suggestions on which plugins would best done for this ?

1. One for registration/forms/exit forms etc
2. How to add phone number field in sign up form.
3. Best plugin to send emails to lists.