It's really REALLY easy to do BT to the messager. First pair them, and then right click on the file and goto send to and bluetooth device, choose your R450 and walla it will send. You can also pair up with another phone and send through there. When you get the memory card, put the card in your phone first, and it should make the directories, if not format the card in the phone (just erases what may be on there) and it will then make the directories My Music, My Ringtones, and My Images I believe.
Put the wallpapers that you want into my images, put the ringtones that you want into My Ringtones, and then any music that you may want to play, put into My Music. PM me if you have any problems, it is pretty straight forward, and SUPER easy if you use the memory card.