You can either choose new game or on the title screen hold B, up and select together and say yes to delete all of your data.
edit: new game does not overwrite the old save data.
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When you start soul sliver press pokewalker and choose you Pokemon and connect it to you ds then Wala!
yes
you can't you can, but only by trading all your Pokemon to another game before restarting, then trading them back after you have gained the ability to.
well u just have to make a new game
i think you mean start a new game so yeah. you just have to go to the menu in the beginning and instead of clicking on your saved file you go down where it says new game and click on it. beware though, in Pokemon if you start a new game you will lose all of your saved data so think before you do it