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1. import your Ai as composition (you can choose retain layer size or no, does not matter)
2. click twice on the composition to open it (very important, do not drag the elements into a new composition)
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If you're on a Mac, the options to import as footage or a composition are hidden, so make sure you click the Options button at the bottom-left of the Import dialog.
As for whether or not to Retain Layer Size, it does matter depending on how you animate. If you don't Retain Layer Size then every single element, regardless of how small it is or where it is in your composition, will have its anchor point in the center of your After Effects comp. This means that if you have a ball, for instance, in the one of the corners of your file and you try to rotate it, the ball will not spin around its own center, but it will instead revolve around the center of the composition, which could be very annoying.
I always choose to Retain Layer Size when I import AI files so each layer's anchor point is in the center of itself, rather than my composition.
Thanks Guys !