1. No, unless you hardmod.
2. Idk.....perhaps a quick google search would have gave you this?
3. You must have had the retail disc to get it to your loader. Yes it will work from usb. Riivolution and Reggie level editor are what you need. Since you are so thrilled with the staff here, I will let you find those yourself. HINT..... add wiihacks into the search on google and you will get good info.