I totally agree with FishWizzard. 40 Rats still gets big bites and you can cast easily and accurately on a MH or Heavy.
50 is fun and also catches smaller fish but is heavy. You need a heavy rod and a lob cast. Fine line between that perfect cast right off the bank, and smashing it on the Riprap, dock, retaining wall, etc. They are durable tho.
Black works well but I dont think the color matters.
Fish them with a slow steady retrieve. You will know the right speed when you hear the clacking and it just feels right.