OK, so you have already ordered a test kit. Now comes part 2 of the TFPC method. DON'T BUY TABS. They have an undesired effect in that they include stabilizer, or CYA, and this is an issue in the long run. The CYA does not evaporate, and once it builds up over time, it becomes difficult to properly chlorinate your pool. You should read
this section. It shows you the relationship of CYA to FC, and how much extra FC you need to keep in yoru pool to hold off algae. Most people with tabs have a story that goes somethign like this. "I have used tabs for a while, never had an issue before, and now my pool is green. What do I do?" What likley has happened is that the CYA has built up so much that they no longer have enough FC in the pool, and the algae starts to win.
Smarter people than me will weigh in here, but re-read the Pool School, and concentrate on the FC/CYA relationship. The reality is that the only thing that you shoudl need to buy in terms of chemicals are
Chlorine - Liquid Bleach or Liquid Chlorine
PH - Either muratic acid to bring it down, or sodium carbonate to raise it.
TA - Baking Soda to increase if needed
The exception about tabs is that if you are going to be away for a vacation, you can use a couple of tabs just to maintain the FC while you are away, since a couple of tabs won't hurt you.