Full game reset

I have an iPad and an iPhone but I want different accounts on each because I think my account now had a bad start what do you think ?

You would have to make a new game center account and log into clash of clans from there.
I think if you sign into a new device it doesn't load your old one right away and makes you do the tutorial then asks to load your old village, but if your already past that, then you would have to make a new Game Center account.

Nope clash of clans needs a new device to start a new account. If. You have loaded a game on a devise its stuck there for now :/