How to create three subnets with different address space?

Question

Cisco Packet Tracer

Need help creating three subnets with different address spaces:
1 - user workstations;
2 - contains external centralized resources (web server, mail server, Internet gateway);
3 - internal centralized resources (database server, file server, network printers).
It is necessary to connect the subnets with a router and ensure that packets are forwarded from 1 to the other two - i.e. provide access to resources, while the other two do not exchange with each other. All packets with addresses outside the ranges must be forwarded to the Internet gateway (according to the conditions specified earlier).