That should be enough for casual (and not so casual) play then, if your other uses of bandwidth aren't too heavy. I do not know any utility to check your use of bandwidth, since I have been fortunately spared that annoyance.
The MUDs I played on have a friendly policy towards newbies, which is the sensible thing to do if you would rather not see a given MUD (and most Internet stuff, for lack of a better word) die off. If there is an active presence of the staff, I wouldn't expect any flame at all, at least for a newbie not striving to become the biggest nuisance ever seen on the Internet.
*Grumbles* This thread is tempting me to get back into the world of MMORPGs (well, once I have more free time on my hands). Must... resist... futile...