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Standard advice is to go slow with your eyepiece purchases. The best eyepieces for you will depend on your personal preferences (wide field of view? how much eye relief? etc), your local observing conditions (how high magnification can your area support, how much light pollution) and the targets you like to look at.
You'll likely only use 2 or 3 eyepieces most of the time. To pick one to start with I might suggest a 19mm Panoptic, giving a wide field of view at about 80x magnification; after that you'll want to jump to the highest magnification that your local conditions will often support.