You can certainly click and drag over your timeline to select several clips at once.
You can add a rectangle to your video in the Title Adjustments workspace.
There is no marquee selection tool in Premiere Elements. Marquee selection is a tool in Photoshop Elements.
If you want more details, it might be best to spread these questions out over a couple of threads. How-tos are a lot to cover in one short forum answer.
Thanks Steve. You answered my main question. Based on your reply, I figured it out. I'm good-to-go. No need to worry about answering all of my questions... what you shared took care of everything. Thanks.
Perhaps marquee selection wasn't available when you answered, but this page seems to indicate it exists - How to arrange clips in the Expert view timeline with Premiere Elements
I haven't worked out how to get the marquee to appear though