What is the key to putting and reading a green?

I am a decent drvier and decent with an iron, and around the green im best in my game, but once i get their my putting is horrible! I cant read a green and i cant tell the speed at all. I 1-putt maybe once in a round, 2-putt maybe 5, and 3 or more putt the other 12. Does the stroke stay consistant and the speed of the club change or does the club stroke go longer and the speed stay the same??? Also how to tell the break in a green??? I really need to practice for the up and coming golf season. Thanks sooooo much!

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