WP & WooCommerce in combination with email

Hi,

I want to have site where I can let people registrate (jus filling in basic data & choose login/pasw). Then they will receive a custom mail. When logged in, they can order a product and receive again a mail with an overview of this order.
We need also be able to attach a PDF to the user profile from the backend. The user can see this file in his account. And we need to send a mail manually about this attachment.

Which plugins do I need?
I thought: WooCommerce for the order, Mandrill if necessary for mails & then something for the attachment.

What is your advice/experience?

Thanks for your input.

Best regards,
Jochen