You should consider it only when observing near double stars. If you place the Barlow on the scope, the magnification is too high for the small aperture. You will be able to see main craters and mare on the Moon. If this all seems confusing (and it is in the beginning), it's always a good idea to take the scope to a local astronomy club, camera store, or planetarium for advice from more experienced observers. With this setup, you can observe the disc of the Jupiter, but also the rings of the Saturn. Which one an observer gets depends on the size and focal length of the telescope they own. In general, look for eyepieces with names like Plössl or Orthoscopic, in lengths of three to nine millimeters. It's always best to check the help guides to see which one is best for planetary viewing and for a given telescope. These are small pieces of optics that help magnify the view through the scope. While the equipment is cooling down, it's time to gather star charts and other accessories, and put on some warm clothes. Many experienced amateur observers let their scopes get used to outside temperatures.
This allows the scope owner to get to know the instrument without fumbling around in the dark to find set screws and focusers. During our observing career of several decades the universe was very generous to us: We witnessed a comet impact on Jupiter, we saw frosty ice clouds on. With a new telescope, it's always a very good idea to practice setting it up inside before taking it outdoors.
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