My Samsung CLP has an Ethernet port. If I successfully make it a Network Printer, can I print from MorphOS to the Network Printer? If yes, how to set up with MorphOS?

Thats actually 2 questions:

a) can you print with that printer ? If it support PCL and/or PostScript, yes (assuming it's not directly compatible with any model listed in Prefs->Printer

b) can you print via LAN ? Check Prefs->NetPrinter (seems pretty straight forward to me).