Im on an iPad, and am having troubles with iMovie.

When i turn my ipad sideways to get the video clips on the left side of the screen, instead of just getting a long version of the video i selected, i get a list of all of my videos on my device. Not only that, but even if i did know how to fiz that problem, i still am unsure of how to select a small part of the clip instead of the full hour long video. Can anyone tell me how to fix these??