iMovie was essentially designed with people like you in mind, so it is perfect for your purposes. it makes a great starter app for video editing, it has excellent features and is extremely easy to learn and use, as well as being fairly speedy. If you get really into it you can always upgrade your skills with FCE, but iMovie is capable of producing some excellent results with very little work, it lets you concentrate on the story your video tells instead of the technical details, which I think tis the way it should be.