Civicrm Entity & Drupal 8
There is still work to be done to get this firing fully - and you many need to reach out to some of the Partners to help get things working sufficiently for your scenario. There are a number that have done a bunch of work in this area.

There are some other Drupal tools that aren't fully firing with civicrm, ones that we use in pretty much every development as they are so helpful in bending the laws of the civi universe - eg Webform_civicrm and Views integration.

There has been a recent push on the webform side of things, and the plan for Views is to step fully in to tieing it in with Civicrm_entity.

You may find you want to join both https://chat.civicrm.org/civicrm/channels/civicrm-entity and https://chat.civicrm.org/civicrm/channels/drupal which is where most of the active discussions are taking place.