Cook County Tax Office

I currently run an e-commerce business (no physical storefront) in the state of Illinois. We ship products to customers within the United States, including Illinois.

Do I need to charge sales tax for orders being shipped to a residence in the state of Illinois?

My company is registered to my house, and I do have a small office there that I run the business out of.

Do you know what I should be charging (percent wise) if I do need to charge sales tax? There is a lot of discrepancy online about different counties, cities, etc. that it is hard to find the correct answer.

I am located in Cook County and my business is an LLC.

Thanks for your help!