These templates are geared towards the layout of comic books, but they work well for magazines too. They will allow you to work out where you absolutely should not place text or images. Essentially, you should aim to keep all text and the focal point of your main image to the live area. This is especially important on the double page spread, where text and images can get 'lost' in the margin of a poorly formatted page.
Finally, even more important than templates are examples. have at least three excellent magazine double page spreads in front of you at all times, and take inspiration from their placement and formatting.
Single page template
Double page spread template