For a single member LLC, you "file" your tax return as you always have. Nothing changes on that front. However, you may need to "pay" quarterly estimated taxes if your tax liability will be above a certain threashold. ($1000 if I recall correctly).
Since FL doesn't tax personal income, you would only need to deal with federal taxes. You can make quarterly tax payments to the IRS at www.irs.gov/payments. When/if you do that, *PRINT YOUR RECEIPT" when done and file it with your business paperwork so you'll have it at tax filing time.
