I am in hopes that your frets are in fair shape. If they are badly worn, you may want to have them replaced. If you have been experiencing fret buzz and your frets are badly worn, this may be the reason for it and not the action of your guitar.
A quick reference for checking the neck’s alignment with the bridge is to place a carpenter’s square on the frets of the neck and see if it lines up with the bridge (as seen below).
This will be a series of lessons due to the amount of material covered. Below is links to each one in case you only need a specific lesson. I hope this helps. So, let’s get on with it!
Anyone who knows me, knows that I am very finicky about the action on my guitar, but for good reason. Why work harder than you have to? With a properly tuned and set-up guitar, you will be able to play as good as you are capable without the hindrance of high action strings, bad fret buzz, and bad tuning. I also recommend that you do all of the steps in the sequence that I have them. One step affects the other, so if you do them out of sequence, you may have to redo some steps again.