Hey,
Welcome to astronomy and the site.
With regards to making the finderscope accurate, this is what I used to do; I'd plonk the telescope in the front yard, stick in a fairly high-powered eyepiece and point the telescope at the junction where a cable meets a powerpole. I got this smack-bang in the middle of the eyepiece, and then adjusted the screws on the finderscope bracket, until the finderscope aligned with what I was viewing in the eyepiece.
It was quick and easy.
Regards,
Humayun
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