I picked up the board today and of course... prior to seeing any of the above responses- went straight for the water to give it a go. I did none of the above.
1. It was chest to head high, with a rapidly draining tide. Not ideal for my first go but c'mon, WTF am I gonna do, go home with dry hair a brand new board?
2. I paddled into the wave faces rather than whitewater.
3. I did a standard shortboard pop-up.
4. I put the mast toward the back- but not all the way back.
5. I got launched
How'd it go exactly? Uhhh... not a TOTAL catastrophe, but wish I'd seen the above input first..... after day one- I can say all spot on advice.
I did find myself wanting something closer to a Kai wing w/ the conditions rather than my Iwa which felt too much. I'll be putting the mast back the last 1/2"next go and damn... dare I say- hope for smaller surf?
Next- my straight one step popup was quick enough to beat coming up on foil but... was like a cruel game of roulette as far as foot position goes. I found that most of the time I landed too far back- felt super sketchy and aborted- bailed off the back.

By luck, I managed to hit the right footing, centered, forward maybe 3 times, raced out of control for about 30 feet with claws dug in before breaching. I talked to a really solid prone foiler on the beach afterward- told me to paddle/position myself further forward than I normally would a shortboard- like with my chin over the nose of the board forward. Said that it won't pearl due to the foil's lift, will keep weight forward on the foil and land my feet about right at popup. I'll have to try that next time.
I definitely have to get my prone paddling fitness back on point- after about an hour, I found myself regressing, had a rare bout of restraint/good judgement and called it a day.
So that's it. Day 1 down- stoked, ready for more humbling.
Much thanks for the feedback. Please do keep it coming if you've got any advice and I'll pass on my progress and hopefully what I learn along the way.