Newscasts consist of four basic components: introduction, interviews, non-interview Shots, and a conclusion.
The introduction simply serves to inform viewers about what they are about to see and to grab their attention. In some ways this is the most important part of the broadcast, so plan it well. Also, after each interview, a shot or voiceover can introduce the next interview, and this is referred to as a segue. It should only be used if one interview doesn't smoothly transition to the next/is about a different aspect of the same story.
Interviews contain the bulk of the information provided by sources. They should contain the answers to questions, but if the introduction and segue's are constructed in a certain way, the questions can be omitted. For camera work, remember to have the camera at eye level, with the eyes on the upper third, and the widest a shot should be is from the the chest to the top of the head.
Non-interview shots are used to keep a flow to the story. Take shots of things related to the story and place them over the audio of an interview. Generally, you show the person being interviewed for a few seconds, then show one or two related shots, then you can conclude, go back to the interview, or cut to a segue.
The conclusion can be used for any updates since the interviews, a comment about possible outcomes, and/or any remarks that sum up the story.
Extracting audio - When you are going to place additional shots during an interview, you need to extract the audio from the interview clip. To do this on iMovie, first place the interview segment on your timeline, cut to the length you want it. Then while holding Command (Apple) and Shift, drag the clip away and then place it back on itself. An audio track should appear, make sure that it gets lined up with the video properly. Once it is lined up, select the video clip, then click on the Sound button (which looks like a speaker) and set its volume to zero.
Placing non-interview clips - Find out how long your interview is and how many non-interview shots you want to include. Also, find out where in the clip you want them to be, because it is a little awkward to switch shots away from or to an interview in the middle of a word or sentence. Once you do this, select the clips you want, set their lengths, and place them where you want. As you place them, the bottom of the screen tells you exactly where you are putting them in the clip; take note of this so you can undo your move and place it in a slightly different place on your next try. Then select the clips you added and remember their length, which are at the bottom of the screen. Select the interview shot you will cut back to, click on the double arrows at the bottom left and remove the same number of frames that the clip(s) added. You can only take 30 frames (1 second) each time you click the double arrow, so you may have to do it multiple times. Now, double-check that the audio is lined up at the beginning and end of the interview.
A possible glitch - In some earlier versions of iMovie, if the computer had just been turned on and was still initializing parts of the operating system, it seemed that the audio and video weren't ligned up anymore. If you turn on your computer and it seems everything is wrong, just wait a few minutes before changing anything.
Adding titles - In order to add titles for the names of those you interview, click on the "T", which is next to the camera and notes near the right side of the screen. When you find the one you want, drag it where you want it to go on the timeline.
The box that previews what you are doing now shows some text, which you can change. If you click "Show Fonts", you can change the font, alignment, kerning, color, style, size, or drop shadow.
If you want to move the title to another part of the timeline, simply click on the blue box that is above the video clip on the timeline, and drag it where you want it to go.
To make the title last longer or shorter, click on the right or left side of the blue box above the clip on the timeline, and drag the edge where you want it to go.