First off, what do you mean by "just started playing?" Level 47 takes a bit of time to obtain and I don't know if a lot of serious raiding guilds will be interested in a level 47 that doesn't know what they are doing. Not saying you fall into this category, but the way you worded your post would make me hesitant to send you a guild invite if I were in such a guild.
Second, I am not sure of the names of the raiding guilds on LD and I play on the server. Your best bet is to go to the official boards and search the guilds there. A good raiding guild will have that information, as well as requirements, specified in their description.
Best of luck to ya!
Edited, Feb 22nd 2007 2:19pm by Mearyk