Please you could to explain me that two words
Could you please explain those two words to me?
I don't understand them.

What does meaning it?
What do they mean?
una cita = an appointment (con un doctor), date (con la esposa, una chica)
to head for bed = irse a la cama
So, yes, appointment is the same as cita (but cita is not an English word).
A heading is also a direction, so yes, rumbo is the right translation. But, the way I used it it is an expression that means 'to go toward the bed' (to head for bed).
As you can see, I haven't fallen asleep yet. I'm taking my kids to school.