CYA is a fixed number. once it's in the pool, the only clear way to adjust that level is to add/remove water as needed. I would start with this first. If it's a new fill, add CYA to shoot for half or 3/4 the amount you need. Wait a full week, test again and adjust.
While you're waiting for CYA to show up in test, get your pH in line.
Next, I would tackle chlorine. how will you chlorinate until you can run your salt water generator? what is your fill calcium level? if you need to add calcium, add cal-hypo slowly and in small amounts to keep down cloudiness. supplement with liquid chlorine (bleach) to keep your FC level relevant to your CYA target.
leave TA last as it will settle into a sweet spot depending on pH fluctuations.
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Now all that is depending on how your PB does startup on a new pool. be aware of what is required for warranty purposes. write down everything he adds to the pool.