What Needs To Be Done

Here's a list of what I need to figure out for this game system:

• Am I going to stick with a d20 system or use something different?  And if I do use something different, what would it be.
• Figure out the mechanics of character creation and management.  Error 404 suggested some good ideas, but the details need to be hammered out.
• Come up with rules for managing the civilization the PCs are a part of.
• Come up with rules for crafting
• Come up with rules for Magic.  This is probably going to be the most complicated,