Converting planes for AI use

Hi all. I need a bit of education here. I want to learn how to convert any aircraft for AI use. I wish to learn that so in time I can replace the MS-83 with other MD's with real liveries as well as the dash 8's. I also have a beech 1900 and an atr, whuch I would love to place in my AI list. I would also love to replace the "charter"caravans with a wider selection of GA planes. Epecially that one. After-all, how realistic does emerald harbour air sound in fridgid Harrisburg, PA, lol.
Thanks for any help guys.
Thanks for any help guys.