If you want to level with fire, I'd go for this:
Wowhead Talent Calculator
When you reach 60 and still want to keep the fire specc, go for this:
Wowhead Talent Calculator
Ignite is not that important under level 60, because you have a low chance to crit with spells and your +spelldamage is quite low, so I'd put the points into Improved Fire Blast and Burning Soul, cause I think nothing is more annoying than spell interuptions. Improved Fire Blast is just there to fill everything up.
As Bloodangel already said, I can't say that a fire spec is good for solo leveling. An ice spec is much better in my opinion because you can take on huge masses of mobs. Activate Ice Barrier, pull ~10 mobs with the same level as you are, frost nova them, blink away, cast flamestrike, then cone of cold and two or three arcane explosions as a finisher. With that, you'll be able to level from 40-60 very very fast. But at the end, you choose. Anyways, if you want to try out an ice spec, here's my favourite version:
Wowhead Talent Calculator
I'd use Arcane Resilence and Improved Manashield, because like I already mentioned above, you'll be able to farm massive amounts of mobs. More armor and less mana drained from mana shield raises your chances to survive if you unfortunately take more damage then you thought. In the frost tree, you could also use Elemental Precision instead of frostbite. This is where it comes to your personal way of playing. If you hit 60 and go to raid instanced like Molten Core, Blackwing Lair etc., I'd suggest to take the points out of Frostbite (or Elemental Precision, depens on what you used) and put them into Frost channeling. With that, you won't aggro that easy and you'll be able to keep casting for a longer time. Another option to improve your mana use is to put the two points out of Improved Manashield into Arcane Meditation. With that and Mage Armor, you'll be able to have 25% regenartion of the normal regeneration while casting.
I hope, that it was not too confusing. Hopefully this helps you
//Edit
Oh, forgot to say: Many bosses in BWL and MC are immune to fire, but a fire spec is much better when it comes to Naxxramas and AQ40.