you could tell us what you planning to do first up....
ill assume your trying to get a team to 85
Have your hearth set in ORG/Stormwind sitting out front of the flying trainer before cata
when you first log in train old world flying 250g ea
since your not going for world first i suggest go buy all your new professions.

i believe "Blackrock caverns" is the first instance available so if you want to instance up you can fly there
or sit yourself there before Cata so you can discover it strait away and farm it (to be a bit more competitive in your leveling)

so.. that's about it i believe