its actually really easy...
for ringtones i use mp3s ( i have only tried it with mp3) , u can put them on by going to user, sound, ringer and right click , new file. then it will upload the song. after that just go to the "get it now" menu, then exit then go to media gallery then tones, and there it is
for wall paper, u have to replace a pic. so take a random pic, then go to bitpim and go to brew,shared,jpegs, then right click and press on new file. then go search for your pic and rename it to the random pic u have taken so that the pic's name is exactly the same, then open it and it should have replace the random pic that u have taken. and there u go. now u can use it as your wallpaper.