Gracy, welcome to the forum! With a little patience and reading of both the forum and poolsolutions, in a month you'll have a better handle on pool chemistry than your builder!
There is no 'transition time' to go with BBB (unless you've been sold Baquacil, in which case this one post won't be able to set you straight). BBB is not a 'system or set of chems to use together', like some of the kits sold by Bioguard etc, rather it is using chems that can be found in the grocery store that will do the same thing as the pool store chems but at a greatly reduced price (kind of like generic drugs). You don't have to add anything to the pool to 'make the change', just use them to adjust your chems when you need to adjust. Bleach (unscented) - 'ultra' usually gives you a little more bang for your buck, when you want to raise the chlorine in the pool or have to shock. Use baking soda to raise your total alkalinity - it's tha same chemical as 'buffer plus' or alkalinity increaser - only it costs a lot less and it's purer (you can use it to make cookies) Use Borax when the pH is low, rather than soda ash or pH plus (this is the only one that isn't exactly the same chem as the pool stores sell, but it's a better way of doing the same thing, AND it's cheeper).
As for burning through a lot of chlorine, you need to have some cyanuric acid in the water to protect the chlorine from burning off, if your builder hasn't already added some you need to test for it and add accordingly (look around the forum and Poolsolutions for the levels you would like to keep and why). As for the unstable pH, it's normal for pH to be high when a gunite pool is curing, again - look around the forum, you'll see it's very common and learn what others here have done about it. As for order of treatment, chlorine must be the first thing to raise if it falls too low - it keeps the water sanitized. Many recomend that pH be your next priority (some of the equiptment can be damaged by improper pH).
This answer is woefully incomplete, but should get you started and alieviate your fears - your homework assignment is to find out why I think my response is inadiquate (answer on request)
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