how to setup wired and wireless networks

i have 4 devices...

main rig
download rig
htc touch / nokia n82 one mine one sister's
office laptop

i want to share all this via wifi. i have tata indicom connection. it is connected via a lan wire and come with a private ip address. my requirements are as folows:
1. download rig or sis's rig On 9pm to 9 am to use night unlimited plan.
2. main rig on as per my reqd
3. at a time i need to be able to connect all 4 or 3 device togethr to share internet.

i would like to give the input from lan to router, but i dont have any clue how to do it... what is the modem you all are talking about in the other thread,, coz my net connection does not ahve one. Please help. Appreciated.

Also which value for money router to buy with approx cost... heard 802.11 g is better option.
 
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