This aint going to be a long post as posting this from my mobile is pretty lame so quick breakdown and you can connect the rest yourself
1 you need a vanilla wow account,
2 Get ya ass to 60
3 make a list off some uber gear you want to use to twink out with at 60. Make sure it includes burning crusade stuff
4 now get burning crusade trial and some friends grab some gear,
5 now your a 'l33t' 60twink playing in av without needing to turn exp off and waiting 2hours for a bg pop.