New home purchase, 1990 pool, skimming and refurb questions

Just started to dial in our "new" pool in the new house. Have an extensive renovation scheduled for July/August that will include resurfacing with Pebble Sheen, new tiles along coping, autofill, new Pentair EasyTouch 4 controller, build of a Cabo shelf, etc.

Pool Details:
-See picture that relates to my questions
-Built in 1990, roughly 15-20k gallons
-Has a main drain with 2 floor returns
-2 skimmer baskets
-1 waterfall, run by a 1hp pump
-1 VS Pentair pump pulling from both skimmer...

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