Stop Motion/Time Lapse
The proper terminology of what you want to do is called either a Time Lapse or Stop Motion video, where are plenty of pictures are taken at the same exposure level at a set interval to produce a video. A time lapse usually involves a DSLR connected to a tripod and a timer that takes a picture on a set interval. Stop Motion is usually when an object is moved, then a picture is taken, and so on and so forth to simulate an object moving on it's own.
Anyway, to import your images into a Final Cut Pro project, press cmd+I, and scroll down in the dialogue box to where it says photos in the sidebar.
It should look something like this:
For future reference, it is more beneficial to import your photos to a folder on your Mac, rather than into iPhoto next time.
Once FCP is done importing those images, it is recommended that you press cmd+B to make a new bin. Label the bin "Pictures." Drag all the pictures that you imported into that bin. This step is optional, but it keeps our Browser nice and organized.
Next, highlight all of the pictures, and put them into your Timeline. By default, Final Cut sets the time for each picture to 01:00:10;00 (10 Seconds). You will have to change this. In this example, we will be changing the duration of each image to 1 frame, or 01:00:00;01. To do this, select all of the pictures in the time, and right click on duration. See the screenshots below.
Once that is all complete, you will most likely have to render it all out. Go ahead and do so, then sit back, relax, and enjoy your final composite.
As always, here are a few examples of this:
Time Lapse:
http://www.youtube.com/watch?v=gAU2Mj5avKY
Stop Motion:
https://www.youtube.com/watch?v=rNocQFccsOE&feature=channel_video_title