1st time pool owner

[chem geek]

BBB for bleach, borax and baking soda does not mean that you will be using all 3 of these chemicals on a regular basis. Bleach (or chlorinating liquid) is the primary product you will use regularly, adding it every day or two unless you have a pool cover in which case you might be able to add it twice a week. The Borax is used to raise pH and in your case is needed because your pH is low, but long-term you probably won't use it very often. The baking soda you may or may not need over time. BBB is more of a philosophy for maintaining your pool simply using store-bought chemicals when cheaper than pool store chemicals and using a good test kit to know what's going on in your pool.

You can get a Taylor K-2006 test kit at a good online price here (the "C" version you refer to is larger in size so is more expensive, but you can get that for a better price here) or the TF-100 you can get here with the latter kit having more volume of reagents so is more comparably priced per test. A comparison of these two kits is in this post.

Use The Pool Calculator to calculate dosages for adjustment. You usually add 1/2 or 2/3rds the amount and then retest in an hour so that you don't overshoot -- at least until you get comfortable with doing these adjustments.