Few steps: 1. Check if the scheduler is active from /system/console/status-slingscheduler. 2. If not active then, Restart AEM3. Check if you are using a workflow step which may be sending emails if not then open a support ticket for further investigation
You would need to change the values there. The values are populated with the deafult ones. If you are still facing issues, pelase raise a support ticket and someone would help you further
Your bundle should be exporting the class which can be consumed by other bundles. if you use the @service annotation, it will expose your class as a OSGI service
Did you enter the correct server details in the main pom.xml of your project. if not, please enter the correct server details , username and password https://github.com/adobe/aem-project-archetype/blob/c66080e74d06cdbfa75151fe0005df5e0e234155/src/main/archetype/pom.xml#L66