Obviously it’s not comprehensive, but in my humble opinion this should be a helpful way to figure out which Star Trek series might be right for you to start with. And I really do just mean “start with.” The show you pick will hopefully be the most palatable to begin with, and give you an introduction to the Star Trek universe. From there, you can figure out what you want to try next. All the series are streaming on Netflix and for free on StarTrek.com. You might also find this Guide for Prospective Trekkies useful!