Small Office setup

Hey guys,
I am IT newbie on and this question came up as a discussion in class. "Design a computer training center for senior citizens who are seeking to gain/update their computer skills. This center will train about basic computers, using the internet, and Microsoft office. All materials must be provided for trainee use.

So there is no budget on this project, but the cheapest way wins, but cheap in the sense where 4,500$ workstations would be impractical as compared to 500$ stations on the market given its for basic computing for seniors.
Ex INFO
20 work stations
30mbps connection provided
~600 sqft room

My thought would be to get a real good router and decent work station with sufficient storage for local storage and performance for tasks need and just wirelessly connect the workstations along with a printer.

but, someone wants to buy a server for the design and hook up from that, as well as you for storage but I think it is unnecessary for the environment it will be in (basic computer classes for seniors and light web usage).

What would be the most best/ efficient way to do this?

Thanks guys