If you are a beginner, the single biggest beginner mistake is too much magnification. If you are trying to squeeze much more than 150-175x out of a 5" telescope, you are wasting your time, and you will only get that much on a night of good seeing.
For the basics on how to setup and use your telescope, see my article
For advice on how to select an observing site and more, see A Dozen Telescope Observing Tips For Beginners
Since telescope eyepieces are the most important accessory for any telescope, you may also wish to do more reading with my article, Ten Telescope Eyepiece Questions
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