By the way, when people keep referring to Aminet, they mean a website which hosts shedloads of free software and other stuff for amigas.
www.aminet.netThere are several mirrors, but this site has a nice gui which allowas (reasonably) straightforward searches.
I wouldn't try browsing for wahat you want, just searching.
If you find a program you want it will probably be archived in .lha format (analogous to .zip, .rar, .gz).
Depending which version of the OS you have installed, it may be possible to just double click on the archive to unpack it. Chances are your a3000 has an older version of the OS though and you may have to do it through the command line interface (CLI).
Hope you manage to get it sorted.
Rich