Low Level BLM : Use transpose once you burn out and then Blizzard 1 or maybe throw a thunder out while MP regens to full then transpose again to start out with AF1 and fire away again.

High level BLM: If Fire 3 and Bliz 3 are available you can start with Bliz 3 go to Fire 3 throw out Fire 1's then Bliz 3 and usually throw out a Thunder 2 before casting Fire 3 into Fire 1 Spam again. If you have only 2 stacks of orbs then T1 would suffice.

BLM is eh at low levels but gets better at higher levels with more stacks of orbs.