Several months ago I was encouraged by Divya of Jewels of Sayuri to share how I make and edit my videos. I probably should start with how I make them, but that's a little harder to film. Iinstead I'm first sharing my process of editing videos in iMovie.
From there, you can begin editing your video. Here's the video on how I do it.
I hope this eases your ability to edit your own videos. However, if you have any other questions, please don't hesitate to ask. I'll do my best to answer them. In the meantime, I encourage you to play in and explore your editing program!