I found one thing that helps with pacing are role-playing game manuals. The most useful was one called "Now Playing" designed to make game sessions out of any television show, which got into detail about beats and breaks and setting up acts and scenes.
Not saying I am an expert, but the guidelines in games like that do help as much as actual writing can.
But, ultimately, the best pacing is what works for you and the story you want to tell.
If you really need a guide, I would suggest watching some older television shows; if you're doing an action, mystery or thriller, then focus one ones that were pseudo-serials like most of superhero shows (especially the ones from the 70s and 80s; some of the more modern ones actually have serious pacing issues), or true serials (like The Fugitive) or had serial arcs like Doctor Who (though the pacing in the earliest episodes from the first three years can be a bit wonky too). Modern shows that seem to have pacing down would include things like True Detective (especially the first and third seasons). If you are doing more slice-of-life or romance stuff, soap operas can give a good guide (especially if you wind up juggling a lot of characters), and there are some very good Korean ones on Netflix to look into for this as well.
If you are looking for things to avoid, you can find some good negative examples in the first few seasons of American Horror Story or Netflix's Iron Fist and Luke Cage (all of these showed clear signs of the "X # of episodes" syndrome - "We have a contract for 12 episodes, but have either 10 or 14 episodes worth of story... nobody will notice if we use a bludgeon to make it fit in the contract").
