It's the back hand (your coffee cup arm in OMBE training) that's the important one, bring that forward, then point the coffee cup where you want to go.
The most important thing with the front arm is to get it out of your way when you're trying to turn 🙂
Your feet should be at roughly 45 degrees to the stringer (centreline of the board) to help you balance, but also to let you twist and look back at the foam.
Commented on Hi, my partner finally got persuaded ...
15 Jul 03:30
When you're starting to walk up, your back knee is sticking out to the side, instead of coming straight forward.
Also, you end up with your hips up, but your head down, all of which tends to look very ungainly.
Look at the Walk up drills and practice that until it becomes muscle memory.
Still, when you do stand up, you're nicely stacked on your front foot 👍