There are many payment gateway options available to use with WooCommerce. Some of the most popular ones are PayPal, Stripe, and Authorize.net. You can find a full list of payment gateways that are compatible with WooCommerce here:
To choose a payment gateway, you will first need to decide which one will work best for your business. Each payment gateway has its own set of features and benefits. You can learn more about each gateway by reading through their documentation or contacting their support team.
Once you have decided on a payment gateway, you can follow the instructions on how to set it up with WooCommerce. There are usually instructions on how to do this on the gateway's website. If you need any help, you can always contact WooCommerce support for assistance.