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Three plossl eyepieces (EPs) is all you need to begin with:
25-32mm (but 30+ preferable) for wide views and as a finder EP
15-17mm for many of the brighter deep sky objects
9-12mm for smaller objects, including planets
Most telescopes will come with at least two of these. For a bit more versatility and more magnification get a barlow rather than more eyepieces with shorter focal lengths, which will be uncomfortable to use due to lack of eye relief.
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