How do I establish a wireless internet connection from my home?

I have a dell pc and a MacBook Pro, I want both use the same wireless connection.

wireless , well dell and mac have their own soft to be on wifi.
your internet connection, just from a plugin on, can serve wifi free.
so, you must see if this one allows several computers.

First, you need an internet connection, then buy a wireless router (like LinkSys, D-Link), follow the instructions of your router, it's quite easy. With the wireless router both of your computers can enjoy the same connection.