I would consider myself quite good with computers, but there's alot I don't know and that will always be true

I'm a bit of a n00b to setting up a LAN, so I was looking for some advice

How much would I be looking at to set up a LAN for approx. 10 computers? (not including the cost of computers)

What will I need, I know I'll need computers (obviously),
So I'll need a modem, a router, a switch (probably a 24 port would be best?), cables (Cat5?), is there anything I'm forgetting?

I want to be able to control the bandwidth and monitor what the other computers are doing from a host computer, also if I want gaming on the computers would I need a server or could I just install the games onto the host computer or the hdd of the client computers?

Thanks for any help