You might've seen my previous project, that online stickman game. I continued working on it and now I require some help.
A perfect example of how the map needs to look like is BrowserQuest (http://github.com/mozilla/BrowserQuest). It will be tile-based and there will have to be some general objects around the map like trees, rocks, etc.
I can't offer payment in return, but at least it is something fun to work on.
If you are interested, please PM me.