How ask a girl out at age 12?

First off, it's gotta be something small, maybe to her fav movie ice cream or just a plain walk

Second, over the phone is the best way to do it and DON'T answr the phone and talk like "heh wanna go do *what ever you plan to do*" Start with somehing like "I heard that *whatever you plan to do* is fun, cool.etc." "Do you maybe want to *whatever you plan to do* with me?" Then tell her when you would like to do it. I've gone through this with my girlfriend and it was the MOST akward thing ever. Now we've been together for 2 years doing the same routine shown above