#1 - What direction are the floor joists running, you would typically run perpendicular to the joists to minimize waviness on the floor.

#2 - You would typically run it longways past the door, so the sun shining in doesn’t go along the board length.

#3 - There’s really no WRONG way to do this, because the LVP flooring doesn’t have much structure to it, and it’ll just follow the contouring of the subfloor. So whatever way you think looks best, go for it.

#4 - If the walls are really out of square, you can also go at a 45 degree angle to hide that. It’ll use up a LOT more flooring, but it also looks pretty cool when it’s all done.

edit: Picture #2 would be the more “right” way to do it, but again, if that’s not what you like, then it’s up to you. Also, not sure if this was just the way you are demonstrating, but you’re also going to want to have a little more randomness in the board ends, don’t have them alternate in a pattern like you have it.

The text in the body of your post literally says “I’d do it like this” and then your picture indicates that you’d start in the middle. You might see how I came to such a conclusion, as a result.