New here - intro and questions

Hi all, 

i am luma, new on that list to learn about majordomo, i found your list in the chapter about 
Majordomo (M.) from the Nutshell Handbook "Managing Internet Information Services. 
Here i hope to learn about administrating an own M. list for a group of students.
I haven't really much experience in working with console-based linux, but i am trying as good as
possible (and reading tfm's, too ;) ). Some questions i couldn't answer by reading:

Majordomo is already installed on my server and i have root access with putty.
I am using the webinterface "webmin" linked with Majordomo to easily create and config lists,
so i have only a few idea which config-files on the server i have to edit for several settings:

Currently M. sends mails from [email protected]  " , how can i set it working to [email protected] ? Do i also have to create this email with a pop account or forwarding 
(and for liste-owner / request etc. too ?)

Also i want to change the texts of default majordomo welcome mails (e.g. from english to german),
but still havent found what im looking for...

Thanx and looking forward to your answers

luma