The book I used recently which made the most sense to me is called the National Song Book. A UK book used in schools. But the songs were selected with the emphasis on rhythmic quality. This helped because I like a beat and a rhythm and the melodies coincided at good rhythmic positions. All of a sudden I was wading through the book at a fine old pace and getting it mostly right.

But at some point you really just need to throw yourself into it and work with yourself the dots and a keyboard. Till you all get along together and it stops being a learning thing and starts to sound like a piece of music.

Using: Dell 3268 i3, 8 GB ram, windows 10. Biab version 2017 standard package, no extras.