Re: wireless
It depends what you mean by wireless internet.
You can purchase broadband wireless internet access from companies like Verizon, which would give you connection in almost any area in the US.
Then there is WI-FI, which is basically local area wireless networks that connect to a land line and give you wireless signal to get on to be able to surf the net. These are called "hot spots" often found in airports, coffee shops, etc. and then there are wireless networks within your own neighborhood and often times you can get on those to surf the net.
If you have internet at home and you want to be able to use your laptop anywhere in the home to connect to the internet then you would need a wireless router or wireless access point hooked up to your existing setting (router or modem given by your internet provider).
In your case, you have DSL? Then you would need a WIRELESS ROUTER which would allow your laptop to connect to the internet as well as connect other PCs to it either wireless or wired.