Computer science. Creating a small network

Help me understand this? Where should I start?

You have inherited a network design, and need to implement it ASAP. It is not the best architected, but you have no time for a redesign.

Initial Network Requirements:

each on their own network

Each network will, near term, have no more than 30 hosts
Assume the four networks will initially have 8, 2, 4, and 7 workstations respectively
Assume each network (department) also has its own networked printer

Design to be upgradeable:

Number of Networks may increase to about 50 maximum
4 of the future networks may grow to about 400-450 hosts – but never more than 500
Remaining networks will never expand beyond 50 hosts per network
The backbone will be upgraded to a 1Gb or 10Gb network from the current Fast Ethernet (100M)

Deliverables:

Complete high-level description of the initial network with diagrams and addresses

for all devices

Clearly document an algorithm so PCs, printers (other equipment?) can easily and systematically added to the network with a proper, unique IP address

Assign initial addresses to the workstations, printers, and any other network hardware using the above algorithm
Document how networks or subnets will be addressed (numbered)