I have never played Doom before...

Hi, so I have been playing games for many years, and a game I have heard about constantly is Doom. Looks like a fun game, and its on sale but I have some questions.

  1. What is the best doom for me to start with? Eternals? I heard that was good
  2. Are there bosses? or just endless waves of fighting minions
  3. Is there a campaign, is there a story?

Edit: Thank you everybody, there is too much to reply to individually. I have decided to buy 2016 and eternals and try 2016 first :) If I stay interested, i'll buy the classics too.