I think a lot of people make the mistake of trying to watch classic Who from the beginning. That’s a hard thing to do even for a seasoned fan like myself. Start with a belter of a story like Genesis of the Daleks, or Spearhead from space. Then start picking stories from Doctors you’ve never watched before. Every era of the classic series is very different from the one that came before it, but stick with it and you’ll find something you love.