This is a philosophical question and the opinions diverge on this question.
There are two types of light microscopes, the compound microscopes and the stereo microscopes.
In compound microscopes, a mechanical stage allows you to move the specimen slide by turning two knobs, which are located to the side of the stage.
The job of the eyepieces is to magnify the image that the objective produces.
The costs of using a microscope, once you own one, are very small. The microscope itself is in many cases the largest single expense.
Maybe you are interested in microscopy, but do not know where to start. Here are some suggestions.
The basic theory of the correct microscope usage can be learned in an hour or two. This can be covered by reading a few chapters in a book explaining microscope use.
While it is possible that amateur microscopists can contribute to the discovery of news species, it is relatively unlikely that microscopic observation alone is enough.
Microscopy is not a very competitive activity. There are annual photography competitions, however.
Some people might be hesitant about starting the hobby, because they do not know if they are going to like it. There are many online resources available that will help you in making a decision.