Well with 3 mbps you won't be able to use it too much... that's like 375 KB/sec. That might be enough for 1 website, but for something like hosting it is useless.
I'm not looking for a lot of clients. I'm not starting a major web hosting business, just looking for a few people to use up some otherwise unused space. I currently get around 20000 uniques/month to my sites, and download speeds are around 200 kb/s.
That means that the connection is already used intensively.... I suggest you upgrade before looking for some1 to share the server with.