Here are some links to help you develop skills in iMovie for iPad:
To embed an iMovie project into a blog, you first need to export the movie to your camera roll.
You then need to go into your photos and share to Vimeo, you may be prompted to log into Vimeo if you have not used it before.
Finally, from a computer (not iPad) you can get the embed code. Please make sure you update the privacy settings as shown in the video below.