The link that Melissa provided will tell you everything you need to know about how to get paid on the Upwork platform.
Read all the stickied posts here in the Freelancer community. Read the Terms of Service. Never begin work without a contract and never accept payment off the platform. If someone offers to pay you via PayPal, don't do it. If someone offers to send you a check to buy office supplies/equipment, don't do it. If someone asks you for your personal information (address, bank name, social security number, driver's license or ID#) don't give them that information, ever.
Mannn, you really need to read the help documentation for noobs. You're about to get curb stomped by a scammer.
You click the "Get Paid" button when it shows up. It's in the My Jobs page in the top-right corner when funds are available.
To see when transactions will be available, click reports at the top of the page and choose the transaction report. It shows when the funds will be available.
Verified credit cards and escrow for flat rate jobs and time tracker for hourly projects.
For flat rate, they will send you an email to alert you that the card isn't verified yet even if it's funded but it also says "unverfified" under the Submit button in the My Jobs page. Verified and funded is a green light to do the work.