international transfer in Beijing, where should I go?

Hi I have a flight from wuhan to beijing on 29th january through Air china arriving at 10:30 pm at terminal 3. then later I have a flight from beijing to doha at 1:20 am. where should I head towards after collecting my baggage from domestic arrival towards international departure since its a different airlines and I need to check-in and collect new boarding pass. please reply asap ..