Hey,
There is no web console like bundles, configMgr in AEM cloud but there is a developer console where you can see all the configs. Couple of points -
1. When you say user email notification and configuration, I am hoping that you are talking about SMTP configuration? If yes, then you will have create configuration in your repository and deploy it as part of deployment process.
you can find more info here -
https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/deploy...
2. Yes, you will have to work locally in your system first then deploy it.
3. If you're talking about AEM user notification then this can be configured under the admin console of AEM cloud.