The JobScheduler application itself does not need many resources. It should be work at any standard implementation of the supported operating systems.
For details about the software requirements of a JobScheduler installation see the document scheduler_installation.pdf in you installation package.
Anyway, the resources needed by a running JobScheduler differs from installation to installation and depends on the number of (parallel) running processes and the prerequisites of the processes itself. Therefore it is not possible to say what resources a JobScheduler server should be provide.
The same is valid in principle for the database used by JobScheduler, but because JobScheduler stores the complete history of its processes in the database we recommend that you allocate at least 20 GB in your database.
The information above are valid for JobScheduler agents, too. They do not need significant less ressources as a JobScheduler server.