Reddit reviews Easy Pop Melodies: for Alto Sax

This by far was the best starter book for songs that I found -

https://www.amazon.com/Easy-Pop-Melodies-Alto-Sax/dp/1480384305

Incredibly well done AND easy to play.

This books works well for learning -

https://www.amazon.com/Essential-Elements-2000-Alto-Saxophone/dp/0634003178/ref=sr_1_1?keywords=alto+essentials&qid=1562175637&s=books&sr=1-1

Gives you the next "challenge" to work on great from a complete beginner's perspective. If you do every exercise in that correctly until at least half way through you'll be playing the previous book easily and the music is written so well for it you could play it on the street if you wanted to. Also lets you log in to hear how it's played and so you can play along.

I would recommend using this random sheet music generator to practice playing playing notes faster the first time you read them -

http://www.randomsheetmusic.com/

An instructor will be needed to make sure you are doing things correctly like getting notes out etc. I would recommend getting also 1.5 reeds because it's almost impossible to not get the note out with them.