There is a free bus. Or it can be walked in 8 mins. Turn right out of main exit; walk to Buchanan Street and turn left; walk to St. Vincent Street and turn right; walk to Queen Street and turn right;...
The easiest way if you don't know your way around is to jump on the Subway at St.Enoch, go 1 stop to Bridge Street and you will see the O2 Academy on your left when you come out.
5 minutes walk. When you exit Central Station through the main entrace, turn to your right and continue until you are in front of borders book shop on Buchanan Street. Turn left and walk up Buchanan...