Haskell Mode loves contributors and we strive to go extra length to help out both newcomers and serial contributors.
Haskell Mode project is managed according to rules outlined in the wiki:
https://github.com/haskell/haskell-mode/wiki/Contributing
When I started contributing to haskell-mode I had 0 experience in Elisp, but it was super easy to learn it. -- geraldus, 2016-01-16
To try out your changes to Haskell Mode without affecting your global
Emacs installation, build Haskell Mode by running make here, and
then run
emacs -L <path to this haskell-mode.git repo>
from any directory you'd like to test in. This makes Emacs load Haskell Mode from this Git repo, instead of using any globally installed version you might have.