Problem:

I am trying to understand how should I set up my email notifications for each stage.

Solution:

If you want send an email notification, you can follow our document to setup a email notification post forms:

Relevant Documentation:

https://toolset.com/course-lesson/send-notifications-when-someone-submits-the-form/

https://toolset.com/course-lesson/setting-up-automatic-post-expiration/#sending-email-notifications-when-posts-expire

Problem:

Solution:
There is no step by step information to convert the legacy views but we offer few course that may help you to learn the blocks step by step.
=> https://toolset.com/documentation/

You can pick any of the course and navigate to your desired section.

However, I've another option that may help you to learn and play with the blocks. Toolset offers free test platform http://www.discover-wp.com where we offer the reference sites build on top using Toolset.
=> https://discover-wp.com/site-templates/

You can use any of the reference site we offer and create a test site for you and play with it and learn how those block based views are created.

Relevant Documentation:

Problem:

I'm trying to add 'event like' information to two different post types.

I want a "repeatable event" to happen any day of the week (every week), multiple times during the same day.

Solution:

I suggest you try with one-to-many relationship instead of Repeatable Field Group, for example:

https://toolset.com/forums/topic/condition-for-custom-field-during-post-creation/#post-2053671

Relevant Documentation:

https://toolset.com/glossary/post-relationships/