After Effects :: How To Add A Picture Partly Into A Video

So, I'm currently making a 3 minute news film at school, and am trying to add a picture into a video, so at the beginning of the news, I want to add a picture either right up or left up corner of the video something like this...
 
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so,,, how do i insert a picture like that into a video?
 
and, additionally, is there a way to make it look like when transitioning the screen, the picture would magnify and fill up the screen.and the film begins
 
so in the example, the bread/snack picture would enlarge, fillup the screen and another video would resume.