help to share internet with psp and anogher computer

hi
srry i am not good in english
i want to buy adsl modem with support adsl 2 ethernet port usb and wifi
i want to connect to internet with my psp ( play station portable )
and i have another computer in other room i want to share internet and hard disk with second computer
how can i do this
or i shoud buy a adsl modem with usb and ethernet and use a wireless pci adapter
can i user internet for psp with pci card ?