Squid - just for admins, not for beginners :)
The bad thing is that to distribute Ineta you will need to read and work with your hands. The good news is that this experience will never be over.
For distribution of an Internet through a certain computer, programs under the general name "proxy" are used.
Try 3proxy .
This is a miracle to put and a little tune up. At a minimum - enter your IP and IP provider DNS. Also on other computers you will need to specify in the browser settings a connection through a proxy, and specify the IP of your computer.
Very well written here about the setting.
Itself used one time this proxy. A neighbor dropped the same links, a person far from computers could do everything himself :)
For distribution, you can also use the "Allow other users to use the Internet connection of this computer." This chip is on the Access tab of the network connection properties. Everything is described there in detail, but I never used it this way, there is nothing to tell me about it.