looking to make custom fan content but don't know where to start

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basically i likre rpg's but there arre times when I have ideas that even blow my mind. the prob;ems beng...

1.  i don't play enough d20 modern to understad how to make a class alone how to create one.
 2. I'd actuualy like to try the thing I just mntioned i ca't do.
3. I need someone to bvalnance me out becaus eI tend to make a lot of female badasses.

here my idea= it would be like d20 modern yusing the sae rulez but have firt type classes that a normal rpg would have but pokemon style secondary clasees. this would be awesome.

so any help.