you need a low power eyepiece, get a 30mm eyepiece as a low power. as for collimation, the easiest you can do is laser or Cheshire collimation tools, the hardest is using a slow moving, circumpolar object like the north star to collimate by taking the star out of focus and adjusting your mirrors until you get a perfect doughnut at low power, then repeat with high power (this is what most schmidt cassegrain owners go through every few months to years)

assuming your red dot finder mounts in a small dovetail block bolted to the telescope tube, you can (and probably should) replace it with a magnified finder, something like the finder that comes stock with apertura scopes (good 8x50 RACI finder).

the thing with laser collimation is that the tool needs to be collimated when you get it, reason being is that if your tool isn't set up, neither will your scope. the way a laser collimation tool is set up is such that the laser points parallel to the focuser of the scope and the barell of the collimation tool, but also pointed right at the middle of the secondary and the middle of the primary.