MailChimp Integration

Hi team
I'm looking at installing the Mailchimp Integration plug in for http://www.habitofgreatness.co.nz as I'd like to have a database management platform in place that both include blog subscribers through the website and subcribers through other channels (directly on the mailchimp form).
I was wondering whether subscribers to the blog also end up in the Mailchimp database automatically?
Also, when people subscribe through the database through the mailchimp subscribers form, does that mean they automatically receive the blog (I wouldn't think so...).

Thanks for your help
Ellen