Hi,
Sounds like the end of the telescope has a aperture reducer built into the end cap. Remove the whole thing for night viewing, you may want to try the 2" opening for viewing the moon if its too bright, otherwise use full aperture, all the time.
You can spend from $50 to many hundreds on eyepieces. The K20 may be okay for a start on Deep Sky stuff. Don't know what the focal length is to work out magnification, but you will need 100 x and 200x max for planetary viewing.
Is the scope on equatorial mount?
Welcome to IIS, its great.
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