When I was at the university this kind of stuff was 4th year material, hardly PhD level.

Just get a book like "ML for the Working Programmer", and go through it and its exercises.

https://www.cl.cam.ac.uk/~lp15/MLbook/

Then either follow up with SML books,

http://www.smlnj.org/doc/literature.html#books

Or jump nicely into Haskell with " Learn You a Haskell"

http://learnyouahaskell.com/