Freelance as a non American dev

Copy pasting my post since I think it's more fitting here.

A bit of my background: I'm from a South American country and been learning React for about a year and Nextjs, Node, Postgres for a few months since the start of the pandemic and finally landed a job in December (Angular tho, sadly).

As you would expect, salaries here are insanely low (currently earning less than 500 usd per month) so a job outside of LATAM would be ideal, but for now I'd like to take some freelance gigs and I have a few questions regarding that:

1) what would be a good first gig to start? Considering it's something I never did before and don't think taking something very complex would be a very good idea

2) in these kind of jobs, is it expected to do backend and db stuff in addition to the frontend?

3) how much should you charge if you're not American?

4) how do you sell yourself? (this is something I always see mentioned when freelance work is in the talk)

all this for pages like upwork/fiver since I don't know other websites related to this.