The entire procedure of landing is rather quick. The only delay is baggage claim. I did it several times in 20 minutes, but it could take even up to 45 minutes, if baggage arrives late.
After baggage claim, you waive customs and now you are in the reception (arrivals) hall:go to exit 01 (on your right) and go to the road platform. There is a signage for the free airport shuttle. The shuttle runs every 20 minutes, 24/7. When the shuttle arrives, tell the driver your destination is terminal 1. It's about 15 minutes drive (the shuttle drives rather slow...) to terminal 1.