Welcome! To answer your questions:
Tapas is a site for both comics and novels and if you want to post images in your novels tapas allows for such
veiws tend to fluctuate for everyone depending on genre, quality, number of episodes, featured or not so even as a long time user i don't really know what would be considered "ideal". I will mention though that Tapas does allow creator to join the ad revenue program after a certain subscriber milestone (varies from comics to novels but the dashboard should mention a specific number)
as far as i know yes but it may have changed? i'm no too sure
With regards to the forums conversations do happen, though level of activity changes throughout the day. On the main site people can comment on you series and engage with any posts you share on the creator wall. It's not super formal so for the most part everything is very chill
Hope you enjoy your time here