After selecting the repository, you will be promted to configure the build settings. Usually Netlify will detect the correct settings automatically. If not, you can configure them manually like below:
Now click on the Deploy site button and wait for the deployment to finish. After that, you should be able to visit your freshly deployed app.
After your site has been deployed, go to Site configuration -> Build & deploy -> Functions region and select the region closest region to where your database is hosted. This will reduce the loading time of your api functions and improve the overall performance of your app.
Make sure to redeploy your site after changing the region by clicking the Trigger deploy button on the Deploys page of your project.