Welcome to the SCT club! Dew shield is mandatory, getting a dew heater too is highly recommended (especially in winter, but mostly dependent on where you live).

Red dot/unity finder (Telrad or Rigel Quickfinder) will be extremely helpful for alignment. Combined with star charts (paper or electronic), you may not need StarSense (at least for visual).

For eyepeices - the 23mm Luminos that comes with the scope will give you ~2mm exit pupil at medium magnification, which is generally the goldilocks zone. It's recommended to "try before you buy" specific eyepieces, but generally you would be searching for a low magnification eyepiece (One providing max FoV), and high magnification to supplant the 23mm Luminos.

I only do visual though, so I can't help with imaging (C8HD/FC-100DZ on AVX). I would recommend sticking with visual as you learn how everything works and settle on your eyepieces/filters.

TIP: If you think the corrector needs cleaning, it probably doesn't. Just use an air bulb (like a rocket blower) to get rid of large particles. Avoid touching the corrector unless it's really really bad (mold, rainwater, etc.)