Setting up a computer network over 50 users?

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Lets assume there is a building. In average there are over 50 users(computers).These computers do have only standard ethernet adapters not with antennas. Besides communicating these computers, you need them all access Internet
at the same time.

How many switches?(3-4 ? which have 24 ports) Do i need to place a router along with a DSL modem? [Some modems
support DHCP also have NAT/PAT capability] Any DHCP server? Should VLAN on switches be implemented ? [is it
necessary to implement security through VLANs and creating separate broadcast domains?]

What should you suggest?

 

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You do have a CCNA don't you? I mean you're asking about networking a small office together, it 'should' be fairly straight forward for someone with a CCENT, never mind a CCNA in scoping this up.

 

Not to rag on you bro, but in the Cisco Press ICND 1 book, they have some good examples of how to setup a small network, etc.. I would recommend you refer to that.