Sewing pants is, in my opinion, is the most difficult garment to make. There are so many in and out measurements to consider. A basic pair of pants is the best way to start. Try a pair of pajama pants, yoga pants or harem pants.This will give a clear idea of how a pair of pants is shaped and how to construct a pair of pants.
You may want to advance to jeans and more sophisticated design details. This is where the difficulty comes in.
No one has a perfect figure. Adjusting the pattern and working with the garment as you construct it, is the only option.
I have searched on the internet and in all the sewing books, I have for the magic formula for sewing and fitting pants, only to discover, there isn't one.
Trial and error is a great way to learn.
If you are unfamiliar with sewing patterns, here are some examples of pants patterns currently available.
The ideal easy pants pattern, is one that does not have zippers, buttons, pockets, or any advanced sewing details.
Sounds a little bit basic, but when you are learning to sew, I would focus on the construction and fit. Getting the idea of how a pair of pants are sewn together and the fit, is half the battle. Here are some easy patterns to try.
Once again, books for reference is always a great thing have in your sewing room. I refer to my library of sewing books often. I may forget a technique that hasn't been practiced in a while or just need tips, either way it is a great way to boost your learning power.