You definitely need to start with your local county/state sales tax office.

Many people wrongly believe online sales are tax exempt. This isn't necessarily the case. If your products, vegan foods are taxes by your city, county, and state, than at a minimum, you will be required to collect those "normal" taxes. Even though your sales come through your website, your location makes you liable to collect and remit the local and in-state sales taxes.

Additionally, your state may have reciprocal agreements with other states to collect and remit sales taxes for online orders delivered into their market.

Your local sales tax office are the place to start.

Dennis