learn from this lesson.
next time, after buying a brand new set of lens, PLEASE, mount the lens only in a clean room, dust free if possible. den using a sandwich bag, put it lens in first, den tape up the other side, which should be your camera body side. the lens end, cut a hole just big enough for your lens, use a LOT of scotch tape to secure it to the front of the lens. make sure nothing is exposed. just to be sure, use 3 layers. do the same thing to each layer, one over another. go out and shoot it like that. when u come home, remove the plastic bags outside your house, leaving only the last layer on (which has the least amount of dust on it), den put it into a fresh bag and bring it into your clean room to dismantle.
do it this way from now on for all lens. please. learn frm your lesson.