If you are new to Figwheel here is a Quick Start tutorial. Working through this Quick Start will probably save you a tremendous amount of time.
Make sure you have the latest version of leiningen installed.
Then include the following
:dependencies in your
[org.clojure/clojure "1.7.0"] [org.clojure/clojurescript "1.7.170"]
lein-figwheel in the
section of your project.clj.