Grandpa has written a good guide for dialup users...check it out here
http://www.gnutellaforums.com/175733-post5.html

Don't worry about the port numbers thing, sometimes changing port numbers can help if an ISP is throttling p2p bandwidth. You don't have to change ports to that range...it's just a suggestion to help those people whose ISPs are limiting their downloads & since I didn't have any info about your ISP, I suggested it. No drama.

You'll probably find that you can allow some uploads...that 'configuring LW for optimal performance' thread will give you tips about upload bandwidth It's p2p after all, so sharing's the name of the game if at all possible (even if you only have a couple of upload slots open)! People will often download from a modem source, even if it's slow, because they really want the file you're sharing & know that modem sources are more trustworthy than some other sources!