Online user guide http://help.adobe.com/en_US/premiereelements/using/index.html where you may look in the upper right corner and RIGHT click the PDF link to be able to save it to your hard drive for offline searching
Editing clips on the left, leads to http://help.adobe.com/en_US/premiereelements/using/WSB25DF517-43BA-42cb-84F8-ECD8D0B4C784. html
After you have Imported the Video files, just drag one, or more, to the Timeline. If you wish to Trim the first 30 sec. from a Clip, just click on the Head of the Clip and drag to the right, until you have Trimmed the first 30 sec. from it.
Another workflow is to Dbl-click on the Clip in the Project Panel, to open it in the Source Monitor. There, you can set the In & Out Points (if needed), and then just click+drag from the Source Monitor to the Timeline.
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Meantime, to learn the basics of the program, check out my free 8-part Basic Training tutorials at Premiere Elements support site Muvipix.com.
And then, if you're interested in simple step-by-step instructions for creating a project, adding media, editing, adding transitions and effects, building DVD and BluRay disc menus and outputting your finished movie, check out my books and tutorials.