For page style, I tend to think of the page as 3 rows and 2 columns, so usually a page is 5-6 panels. That's a very basic layout. I think some basic important things is making sure the spaces between panels is consistent. CSP remembers those settings so that is helpful, but even when I was working on paper, it had rulers on the sides so I always kept the space the same.
Horizontal spaces are thinner than vertical spaces, so panels that are next to each other should kind of go together more than ones below/above each other. (edit - I mean panels that are placed horizontally and panels that are placed vertically, so the gutters between them would actually be a vertical blank space or horizontal blank space, respectively).
Keep overlapping panels to a minimum since too much overlap can look cluttered. Use trapezoidal/not perfectly square/rectangle panels sparingly and effectively. They work great especially for action or very dramatic/emotional scenes.
When placing word bubbles, just make sure to start at the top left and work down to the bottom right.
For the content, have a mix of far away shots and close up shots since I think both are important, but close up shots tend to be overused since they are easier/faster to draw.
As for a scrolling comic, I don't know much about them. I personally find that many of those comics have too much negative space and just trying to make the reader stay longer on the page rather than actual content, so I would stay wary of that.