If you know SCUBA is for you, go ahead and research every piece of gear and buy the right stuff at good quality and nothing less.
Then take your gear and dive locally with the aim to streamline it (hose lengths, where things are stowed, etc), tweak it, get your weights and distribution for best trim right for various type of tanks/changes in exposure protection and note all of these things down for future reference. Then you are ready to gather experience with a setup you know and trust.
If it was me:
Computer - get a good one with AI, Buhlmann algorithm ideally custom gradient factors, nitrox etc., to future proof it as you advance (yes Shearwater fanboy)
BCD - get a BP/W, steel if mainly local, alu if mainly travel, simple webbing harness, 30lb or so wing if diving single tanks (take a look at XDEEP, I would if I was in the market)
Regs - get a high quality set, balanced, environmentally sealed, Venturi/WOB adjustment on second stage, don't skimp on the Octo (Scubapro is a solid choice)
Mask - consider a frameless design for the best field of view, get two and carry one as a backup (Atomic does fine masks)
Fins - get some sturdy rubber fins with metal spring straps, fat rails that work well for a frog kick and helicopter turns (fan of the Zeagle Recon here)
DSMB - suggest a small closed oral inflate DSMB on a spool (Halcyon does a nice one)
Cutting - get a knife and a trilobite
Lights - get a couple compact lights around 1000 lume with multiple power outputs, 18650, push button (I like the Sea Dragon Mini 900)
Emergency - think about a storm whistle, your lights, a PLB in a canister if boat/remote diving
Exposure protection - get a drysuit if it's actually cold, everything else is miserable in cold water. Ideal to have a drysuit and a 5mm as it will cover a great range of conditions. Additional gear like hoods, hooded vests, socks, gloves etc. go a long way in improving comfort when diving wet.
Redundant air supply - maybe you like the idea of diving with redundant air supply right away, so consider putting your octo on a compact regulator on a slung pony bottle of sufficient capacity for your depths based on your SAC.
Tanks - if you are going local more often than not, look at getting a steel tank, Faber 85 is a beautiful choice getting some lead off you and into a nice and compact package on your back, with AL80 comparable capacity.
Do not fall for dive packages at your dive shops. Research and dig deep and you will be able to dive the same setup for a very, very long time, without regretting your 'retail outfit' choice.