Well, My opinion is slightly different.
Fire Blast isn't quite as good for use as Flamethrower is and Vulpix learns flamethrower at level 24.
So unless you want...
Safeguard -27- Not too usefull
Payback -31- Is physical, so not super great on him
Fire Spin -34- Hasn't been a very useful attack since Gen 1 or 2
Captivate -37- This only works if the foe is the opposite Gender, And its still not the greatest
Grudge -41- If you faint the turn you use this, than the oppnent loses all of the PP of the move they were using, But I honestly think Just attacking again would be a better way to spend your turn
Extrasensory -44- The Only Really Useable move he gets after Flamethrower, this is a pretty sweet move to have.
Fire Blast -47- Flamethrower works much better and is learned at a lower level, Go figure.
Honestly, I would say that you should Either Evolve him,
After 24 ( Flamethrower )
Or 44 ( Extrasensory )
Have fun with your Ninetails!