You should begin where each scripter at some point has, downloading an example of Squirrel language and trying to understand it.

Only after you know what each thing does at certain places and what each function does you can start creating your own scripts or code.
As for ideas you want to share, we do have Ideas & Suggestions -subforum where we would love to hear any ideas from any players.
We are always on the lookout for new staff, but when it comes to scripters it is good to have knowledge of the required language first.
