Ethernet Networking through walls

im getting a new comp soon and im planning to go with ethernet im connecting 2 comps to 1 router to a cable modem in my downstairs office im planning to send a 100ft or 50ft cat-5 line upstairs... i was just wondering where i can find info on how to get a cat-5 line to my room through the walls of my house to me this sounds very confusing and not worth the trouble but of ne of u have tips or arcticles online? i seem to not be able to find ne

with an electric drill you make the holes where necessary

You can get away with smaller holes if you use plain cable and crimp it after running the cable through.

or if you can't be bothered, get a home wireless networking kit. they are more expensive but probably better for the home, unless you have a small office home office setup like a room which has several computers networked in it, like me. otherwise, if your machines are in like the kids room and the living room, or something, maybe you should consider wireless.