I'm new as a contributor here, do any of you guys know how does selling work if you're not located in USA? Any experience with taxes?
Many Stock Contributors are non-US citizens. It's not a problem.
See the Stock Contributor User Guide for more details.
If your country of residence has no tax treaty with the US, your tax withholding rate is 30%.
Thank you, Nancy!!
Taxes are dependent on a treaty between your country and the USA. You will need to fill out a form to clear your tax situation with Adobe. You are responsible to declare your income in your country according to the countries rules. The payout from Adobe will be the earnings minus the required US taxes. For many countries, the bilateral treaty say that you pay taxes in the country of residence. For some countries, you need to pay a reduced tax in the USA. Whatever your specific situation is, it depends on bilateral treaties between Costa Rica and the USA.
As for the rest, look into @Nancy OShea's links.