Well water is often, but not necessarily, a problem. If you have a well in limestone, your water may be ideal for pools. But if you have a well in iron or manganese bearing rock, it may be mess. You may want to do a metals bucket test, before going too much further, so we can get a handle on whether your well water is 'easy' or 'hard' for pools.
Bucket-test-for-metals
Otherwise, you may just want to use the 'Super Simple' recipe, here:
Super-simple-pool-chemistry-recipe-for-Intex-type-pools-start-up-&-routine-care
Good luck!
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