How to Design Programs, Second Edition[1] is a good resource for learning how to model and program in a style that will translate well to full-blown Racket. See also Realm of Racket[2].

The Racket Cheat Sheet[3] is handy, and provides some useful links at the top (cf. "Sites", "Community").

[1] http://www.ccs.neu.edu/home/matthias/HtDP2e/

[2] http://realmofracket.com/

[3] http://docs.racket-lang.org/racket-cheat/