If you join an astronomy club and have a car you should be able to go there with your telescope and I am sure somebody will be able to tell you how to use it.
I did buy a dob two months ago and have been able to see a lot of objects.
The moon is big of course, but if you want to look at something smaller it is usually better to start with the 25mm eyepiece to find an object and focus and then change it once you have found the object - at least with a dob, but I think it is a general rule.
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