This sounds promising! I do have some questions, though.
"20 to 60 minutes a day" — Do I have to do that all at once, or can I stretch it out by working a few minutes an hour?
"daily salary can reach 200 to 500 US dollars" — Assuming I work the full 60 minutes, that works out to $200 to $500 an hour. I'd like to bill more than one hour at that rate.
"The basic salary is more than 2,000 US dollars per week." — By my math, that means I'd be working anywhere from 4 to 10 days a week depending on the daily salary.
