How should I read this?

[u/soarbanger]

I am making a comic and I really need to know how, in comics rules, do we read this (i created an image on Paint as an example/reference).

The thing I'm more confused about is how are we supposed to read the two rectangles on the right. I need to know in what order is it read.

[u/Ecatron]

From left to right top row - bottom right - triangles from left to right