How much is tax for commission agent in USA?

I'm a commission agent who is selling commodities for companies around the world or import/export products between countries.
If I sign an intermediary contract with a company outside USA, how the process will go to calculate my tax? Base on what to calculate it?
TIA.

I am using the services of [link moderated]. I am selling woman clothes to US. I think you can sign in this company as non-resident importer, I've heard that it is very convenient. For more details you can ask their customs consult, he knows more information. Like this company cause it does all the work for you.

i can help you to calculate your tax

@Hassan Hossam

If you have information about taxes please share it here on the forum.

I'm expert in us tax so if anyone have any question i'm ready to answer