So fill out form 1040ES and calculate it.
FICA (12.4%) is capped at a little over $100K.
MC (2.9%) isn't capped.
1/2 of the above is a deduction on the 1040.
On your schedule C, you list your income and any expenses that you have proof you paid that are reasonable and necesary.
As for late paying, if you owed taxes last year and you owe this year and didn't make estimated tax payments, there is an 8% penalty (actually 4% since it's weighted over the year).
How much taxes you will have to pay is based on about a few hundred factors. Possible DEDUCTIONS would depend on your expenses incurred for your business. You will have to pay federal income tax, possible state income tax, social security tax, medicare tax, plus any other miscellaneous state ans local taxes. If you underpay your taxes ON PURPOSE, that is called tax evasion and you can go to prison. Self-employer people who make significant amount of money is the IRS's #1 favorite audit target.