Do we charge taxes with our products?

We charge sales tax on orders sent to Illinois, otherwise, sales tax doesn’t apply anyway. 

For international orders, do my customers need to pay custom duty fees? 

This varies from country to country so we would suggest referring their custom's fee policy.

Can you guys help with our taxes? 

Regarding taxes, we would recommend consulting a tax professional for state-specific tax concerns as we do not advise on this matter due to potential liability.