Here are some tips for using WMM

:
1) Putting in the videos/music:
Go to 'Import Media' on the toolbar and click on it. You will then be able to find where the videos/music files are saved on the computer. select them and then click 'Import'. They will then appear in the main box in the center.
2) Adding them to the timeline:
below the box with your video files and the preview screen to the right, there will be timeline where you make your video. to add a video/music file to the timeline just drag it from the box to the timeline.
3) Making the clip shorter:
To make the clips shorter you can drag either end of the video once it is in the timeline. if you go to 'Clip' in the toolbar there are also other options too
4) Transitions/Effects
once you edited your clip you can add transitions between them by going to transitions which is under edit in the side panel. just drag the one you want onto the clip this also works for effects (effects are things such as zoom, rotate, pixilate, black and white etc)
5) Making your timeline into a video:
when you've finished your video go to publish in the sidebar and click on 'This computer'. You'll then be prompted to give it a name and say where it'll be saved. you then choose the quality you want to save it in (best quality for this computer is the best for when you upload it to youtube). you think click ok and after it has finished making it into a video you are now ready to upload it onto youtube.