Before you buy anything
A few things worth knowing first
Make sure it has 88 fully weighted keys. This is the single most important spec, and it's where cheap 'digital pianos' lie. A real piano has 88 keys, and they have weight to them — pressing them takes a small amount of force, the way an acoustic piano does. 'Touch sensitive' is not the same as weighted. 'Semi-weighted' is not the same either. If a $200 keyboard claims to be a piano, it has 61 plastic keys, and you will outgrow it in three weeks. Skip it.
You don't need an arranger keyboard, MIDI controller, or synth. Big-screen keyboards with rhythms, accompaniment styles, and 500 sounds are a different category of instrument — fun for songwriting, terrible for learning piano. A real digital piano has a piano sound, maybe a few alternates (electric piano, organ), and that's the right amount.
You don't need lessons immediately to get started, but you do need a method book or an app. Adults teaching themselves piano with no structure plateau within a month. Pick one curriculum (Alfred's, Faber's, or a paid app like Simply Piano), do it in order for at least 60 days before evaluating, and you'll be playing real music.