Router Problems

What’s up every 1 I got some problems and some questions. First things first I don’t know that much about networks and lans But I recently purchased a Linksys WRTP54G Router and I got a cable modem. The thing I want to do is download files from A P2P Network But my connection is as slow as what it was when I had Dial up so I did some research and all I know is that its something to do with the NAT firewall and that I have to open ports to use my modems full potential. I wanted to know how to do that and if you guys have any recommendations for P2P software that supports users with routers Thanks for your help

There is honestly only one thing that comes first: RTFM.