You should only use your own.
Anyone can make a Minecraft account at Minecraft.net
If you own Minecraft on that account then YES!
Anyone can make an account at the Minecraft.net website.
You don't connect it to Minecraft, you connect it to Game Center in order to get your account. Regardless of having an account or not, you can then use the seed codes provided in the app and use them in Minecraft to generate the worlds of your choice.
no
You cant! Mineshaft is just another scam. If you use your minecraft info on mineshafter, IT WILL GET STOLEN!
Clear all the Minecraft folders on your computer and don't use the same Minecraft name :D
I am pretty sure.
No, you have to use your gamertag.
Use the VISA to sign up for paypal, then buy minecraft with that.
No you cannot because it is not designed for that.
Use your email in the username box instead.