This is Finley from the Social Care team at Shopify. Thanks for your question, and welcome to the Shopify Community!
You can find all the payment gateways available to the country your business is based in here.
Once you know which payment gateway you'll use for your online store, you can activate the gateway from your Shopify Admin > Settings > Payments. Depending on your country, you may see the option to activate the Shopify Payments gateway or PayPal. Otherwise, if you plan to use a third-party provider or alternative gateway, you'll see the option to set those up as well:
If I can help clarify any other details, please let me know!
How is everything else coming along? If you haven't yet checked out our Shopify compass, I highly recommend it! We have an introductory course that you can check out here. This course goes through the website setup process, including setting up a payment gateway.
I hope you're having a great day!