Islay can be reached via plane from Glasgow or via Bus from Glasgow to Kennacraig followed by a ferry to Port Ellen or Port Askaig.
For flights, see http://www.flybe.com/ If you plan to fly you should book very early.
For Citylink Coach, see http://www.islayinfo.com/travel.html
Accommodation will be in guesthouses in/near Port Ellen.
Local travel will be provided.
Tourist information can be found on the following link: http://www.armin-grewe.com/islay/islay-guide-v6.pdf