Please expand on what you mean by a loop recording, I don't really understand. You can record in loop mode, you can record a track and then loop it but a loop recording, hmmm not sure.
The metronome deal is pretty easy. Just go into the options tab, go down to metronome and check the click enable box. Here you can also set what type of metronome you want, how loud, etc.
Oh and welcome to the board and be sure and check out the CUBASE FORUM and other specific boards for specific questions, you'll get more answers that way (and from far more knowledgable dudes/dudettes than I).
Laj