Share 'Teen Tech Nerd (Wana~B)'

Hey fellow Geeks. I recently got a new PC, and I do not want to get rid of my old one. I was thinking I could put my web coding and Flash coding together and make a website. I was thinking of making my old PC a server to put my site on to then run it to the internet. I'm trying to learn all this stuff so if a few of you could help me out. Tell me what the best OS is. I'm assuming Linux, what ve...