Aaaaaalright! My territory
step by step: first off, download simpleMU, it's the best current client you can find around. Second, download the mudconnector database so you can see all muds. It'll take a while, it's normal. Then choose a mud from the list, I suggest a rom-based one cause I know rom better and can help you off if you need anything. Then connect and disconnect and say yes when the client prompts you to store the mud in your adress list. Then go to your adress list and right click on the mud to get the properties up and change the mud type to mud all types, so you won't have that problem of not seeing 1/3 of the screen. Then connect again, give name, pass, chosse race class sex, and don't customise at first if it has customisation. typing help brings about all helpfiles. If you want to use numpad as directional go to actions on the top bar and click it, it's helpful. Anything else ask away, I'll help if I know.
addendum: btw if you want a really good mud to start off got to afterlife. It's not my mud, but it's my favourite. The people there are extra helpful, it's one of the oldest ones in existence, but it's not role play. Given that you'll have some of the immortals in there to help you though, and you're dead new to mudding, i really sugest it. If you go there, start in the village of Taheria, not New Thalos.