Amiga & Ethernet
Toasters don't connect directly to a network. Amigas with Toasters in
them do. Depending on what you want to do over the network, different
software is appropriate.
What do you want to do?
You might grab a copy of my book (Connect Your Amiga! A Guide to the
Internet, LANs, BBSs and Online Services). It has info on "compatible
cards & software" and "where [you] would write for further info."