wiring bathroom fan and light to run seperately

As my subject indicates, I am trying to run a bathroom fan and light on seperate switches. Here is the visual:

I have three wires running to the attic from the switch; they are a black, white and red. The switch is a 2-rocker switch (Leviton).

In the attic, my bathroom appears to be running on parallel wiring as there is a white and a black running to the fan/light wiring and a white and a black running from it (I believe to the next room).

The fan and light each have two wires. There is a white and black, and a white and blue.

I currently have the fan and light working at the same time by wiring their blue and black to the red coming from the switch (the red is connected to one of the loads) The black is the common (running hot I believe) and the white is connected to the two whites from the fan/light, but is unconnected to the switch.

I am unsure how to seperate the loads. The house is older and the wiring has no ground wire.

James