I'm basing it off of a job system like Final Fantasy Tactics and it uses a D20 set. The systems are fairly basic because I want the players to focus more on roleplaying and making the game fun for themselves without having to lose the feel for a scene and the narrarative for the story by having to constantly look up rules for situations.

So for the sheet, I'll need a descriptive block for the top of the sheet where the character describes their character. (name, race, age, etc...)
Then I need a block to take up the middle of the page that covers the characters attributes, defense, health, and a couple of other miscellaneous stats.
Next is the bottom of the page where they will have slots for job abilities and other skills and abilities that would normally show up in these sections.

I'd also like to have boxes on the back of the page or on another sheet that covers the jobs and abilities tied to each job. Nothing very big, just something that the player can use to keep track of how far into each job they are and which abilities they have available to be slotted on the front.