I would suggest forgetting Photoshop for video editing. You can do some work in it , but (IMO) it's not got the facilities you need as a video editor. Download the trial of Premiere Elements and give it a try. You get native handling of most video formats, multiple video and audio channels, effects, etc, and the ability to author DVD, Blueray and output to other formats.
Then download the trials of other editors - MAGIX, Vegas, to name but two. and give them a try.