No and no. you shouldn't ever normalize anything before mastering. most DAW normalization things don't sound great. and there aren't any settings that are good starting points. first listen and decide what you would like to change and then taylor your compressor to achieve this. play with all of the settings from min to max and find out what they do to the sound, then go from there

Michael is correct. I'd also suggest you look at the other current 'normalising' thread where I've posted a couple of replies.