How do I watch tv episodes online?

Please help, I have spent hours trying to figure out how to select and watch a tv show from the web. I even paid and had utorrent put into my computer. Every web site I’ve looked at tells ‘watch tv episodes here’ and then I can never figure out how to get and play my show. I have screamed more then once today. Please tell me, what do i do? (I want to watch Veronica Mars episodes)