when i open my own business what kind of taxes i have to pay?

Answer 1

Actually, you'll be able to take many deductions that are not available to employees. What it basically boils down to is any expense used in your business for the purposes of operating your business is a tax deduction.

There are tons of laws involved, so the statement above is a generalization.

Here is a link to an article with more info.

Answer 2

You'll owe self employment taxes, plus sales tax at the very least. If you have employees, there's more forms to worry about.