This is the order I'd teach you in if you were sitting in front of me, from your first note on the practice chanter to your first tunes on the pipes. Six stages, each with the lessons to watch, what to practice each day, and how to know you're ready to move on. Everybody moves at their own pace, so treat the timings as a guide, not a deadline.
Get a practice chanter that sounds good and is easy to play, then put your hands on it the right way. Everything after this rests on good form.
Move on when you can put both hands on the chanter correctly without looking, and get a clear, steady low G.
Bagpipe music has only nine notes, from low G up to high A. For each one you learn its name, its fingering and where it sits on the staff, so you learn to read music at the same time.
Move on when you can play the scale up and down with no crossing noises, and name each note on the staff.
The pipes can't get louder or softer, and they don't stop between notes, so we use gracenotes to separate and emphasize the melody. They're what make the pipes sound like the pipes.
Move on when your gracenotes are small, clean and even on every note.
Embellishments are gracenotes in combination. Now you put them into your first real tune.
Move on when you can play Scots Wha Hae from start to finish, slowly and cleanly. Play it for your family and record it on your phone. You're a piper.
The bottom-hand embellishments open up most of the tunes you'll want to play.
Move on when you have three or four tunes going well, with clean grips, taorluaths and birls.
As a general guide, I like to see about half a dozen tunes going well on the practice chanter before you move to the pipes. Don't rush this. Good fundamentals on the chanter make everything after easier.
You're ready for the pipes when you have about six tunes going well on the chanter and your embellishments are clean.