e commerce – Recommended frame size, resolution and typography scale

I’m a junior designer so I’d appreciate it if you could give me as many details as possible πŸ™‚

I’m currently designing an E-commerce website (PC for now, maybe add a mobile layer later on) and would like to know how to space the elements properly (recommended grids and margins), which typographic scale sizes are recommended and what frame(screen size reference resolution) to use.

Thanks for all the help ☺️