As country is not listed, I think it's Russia.
- First go to paypal, but it concluded in rubles, will lose when converting money. Paypal transparent to our tax so it's not suitable for regular income.
- Immediately order your payoneer card, there will be a conclusion in USD, the Commission for the removal will be 3-4%, but will be able to withdraw in us dollars and hoard them, it turns profitable.
- You can try to be self-employed, it is much easier UI, but there is a limit to 200k a month, a couple of people work so upwork, but better to find out directly from the Bank, with whom you will work, the calculations of the self-employed with foreign companies not described in the documents.
- When the amount exceeds 100K, you have to issue the IP, patent or USN, is a broad topic, look at the toster/habr a bunch of times already specified. A percentage of your salary going to taxes/Commission will very much depend on the Bank, wages, taxation system, but in the range of 2-10%
In fact, if there are no plans to save in the Bank or to make large purchases (over 600K, such transactions are automatic sent to Rosfinmonitoring), it can work as long as you want through payoneer, have not found any confirmation about the possibility of a tax for that though as that to press, many friends and work.