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First, talk with your city's planning dept to see what the current standards are for your proposed work.
In Oregon...
Grounding is required on all circuits, and in bathrooms specifically...
A separate line (circuit) is required for the (required) GFI receptacle,
and that line miust be dedicated. i.e., it can not have anything else on it.
All receptacles have to be the new type that prevent kids from
poking paper clips, fingernail files, etc into the openings for the plug.
The light(s) and fan can be on the same circuit.
Separate switches for the light and fan were optional.
The fan vent-duct required "metal tape", not the usual duct tape.
Our ventilation fan required a "timer switch", instead of the usual off/on kind.
At the circuit panel, I think for what you have described, you just need 2 circuits (no heater).
You already have 1... the original, for lights and fan.
So maybe you only need 1 more... for the GFI, and
that will probably have to be 12 gauge wire (20 amp) to accommodate hair dryers, etc.
But you also need advise on what they will allow for the needed ground wire(s).
And it's "illegal" to wall off a circuit that simply terminates.
You must use a junction box at every branch or termination.
FWIW, if you install the fan and vent, a licensed electrician might
do the GFI circuit and wire up the fan for about $200,
and so the permit and safety would be on his shoulders.
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