"Where I can fill my taxes for business (Corporation) online using Turbotax?"
In order to prepare an 1120 for a C corporation or an 1120S for an S corporation, you will need to purchase a copy of TurboTax Business as well as a personal income tax preparation product (see note below).
See https://turbotax.intuit.com/small-business-taxes/
Note: TurboTax Business must be installed and run in a Windows environment; it is not available as an online product nor will it run natively on a Mac. Further, you still need a TurboTax personal income tax preparation product since TurboTax Business is not capable of preparing individual income tax returns (it can only prepare returns for entities).
With respect to the State of Florida, the only S corporations that need to file an income tax return with the state are those that were formerly C corporations or those that pay federal income tax on Line 22c of Federal Form 1120S. If you need to file a Florida Corporate Income/Franchise Tax Return you can purchase that return, and any associated forms, from within TurboTax Business.
See http://floridarevenue.com/taxes/taxesfees/Pages/corporate.aspx
