Wanted Need help finding a pj bottom tutorial

I have been looking everywhere for a good tutorial on elastic waist pj bottoms and have had zero luck. I need one that shows me how to make the pattern, and how to put them together. Most of the ones i find are using an existing pair or just fugding it to get somethong good enough. I dont want either of these options. I dont mind taking a few tries, but i want a pattern so I can make more later. There is a tutorial here on doa for shorts thats close, but it wont work for longer pants. I cant find anything here or on youtube. Anyone know anywhere else I can go for a good tutorial?

Edit: I am still a newbie when it comes to sewing so it needs to be easy to follow.

 

Not quite. My computer and printer are...unreliable at the best of times, so i need instructions to make my own pattern. Thank you though!

 

That second video is great. It makes at least some sense. Thank you so much!

 

I live in a tiny town. Im not sure if we even have a library. I did find a tutorial that worked though.