Global Tax, Domestic Tax and Yearly Tax Filing for Online Business

Hello, I run an online business that is based out of the USA. Although my business is US-based, many of my customers come from countries all over the world. This is my first year in operation [2021] so I want to be sure I am in total compliance with all tax laws -- federal, state and global. Mainly, I need help with: 1) Understanding and complying with global tax laws. Specifically, it has been brought to my attention I may owe VAT tax since many of my customers come from the EU. 2) Complying with state sales taxes. I may owe sales tax in other US states. I want help determining if/how much I owe in back-tax for this, as well as how to collect it and pay it. 3) Estimated quarterly deposits. I have made estimated quarterly deposits for 2021 [Q1-Q3] but I need help ensuring these deposits are on par with what I am earning. 4) Yearly tax filing. I need help preparing for and filing my taxes for 2021, as well as saving as much as I can in business deductions / expenses. I would like this to be an ongoing business relationship. I need a tax expert I can regularly hire and consult for all of these tax questions who has experience in all areas and can help me move forward in total compliance.