Shower tiling advice

hi all,

I’m tiling a new shower and looking for some professional advice on best practice and what will look best.

Shower tray is 1400 x 900 and I have 2 walls to tile (1 each of the sizes)

My tiles are 600 x 300

Right so questions are:

What orientation should I lay?
Should I install tray first then tile to this?
Should I PVA the newly painted wall?
Should I lay as brick pattern (half bond)? Or stacked?
If I go stacked, should width cuts be at the corner or sides?
Should I start with…

Shower tiling advice