Taxes re. FBA in USA as UK seller

We have been doing FBA in USA for few years but do not have any tax setting set up.

We are VAT registered in UK and only do FBA in USA.

What are if any tax obligations or set up of tax settings supposed to look like?

Its very confusing but i was under impression that there is no VAT to pay but actually might need to consider other taxes?

anyone have experience?

Thanks