Almost everyone uses Google to search for information and businesses. Google makes it easy for you to add your business or claim your listing (for free) so that your customers can find you whether looking specifically for you or for a business like yours.
To get started, go to google.com/business and use your Google account to sign in. If you don't have one, you'll need to create one over here.
You'll be taken through a series of steps to setup your business listing (if it's listed already, you can claim it). You'll be adding your business and contact information so that your Google presence is complete. Google allows for comments on your business listing, so if you'd like to respond to those, make sure your Settings are updated with that choice.
Google has comprehensive help on this feature, you can find more on their help pages.