I good place to start is either by making basic scenery or inventory art. inventory art can be easy if you find a good picture on line and trim it up a little bit and convert it to a FRM.
Also writing Dialog is very useful, finding a good writer who can write a dialog tree is a real help.
Practice writing a dialog in a tree structure with different options.
Even just general story ideas such as original quest ideas rather than the normal "go to location x and bring back item y"
If you have some good ideas let me know, you seem enthueseastic which is a good start