First of all, congratulations on your profile approval and welcome to Upwork. There are various ways you can get paid here on Upwork. However, the fastest and most convenient way is the Local Bank transfer. It's the fastest because it takes less than 3 hours(for me, I use GTB) to get credited, most convenient because you get the naira equivalent, no hassle of trying to sell your dollars. Finally, it's quite cheap, the transaction fee is less than $1.00.
Just add your bank details and your bank swift code(search the internet, its there) and within a few business days, your account will be confirmed. Note: Your account name and Upwork account name should be the same.
However, if you need your earnings in dollars, probably you want to make some transactions in dollars directly or you have an easy way of reselling the dollars, you can go Payoneer.
For now, your key focus is to land those jobs and build your job success, getting paid is one of the easiest processes on Upwork. Once again, you are welcome and good luck.
"A dream doesn't become reality through magic; it takes sweat, determination, and hard work."