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tons of great advice above. With telescopes as with camera lenses the numbers dont mean too much and its the quality of the optics that you are really paying for and with cheaper beginners scopes the eyepieces and barlows/erecting tubes often use plastic optics instead of glass which can effect the quality of what you see greatly. Plus every layer of optics the light has to travel reduces the potential quality at the eye or camera sensor. So for now I'd forget bothering with the erecting tube as its likely doing you more harm than good. its handy for when you are able to train the scope on a target and want a bit more close up on it.
Also the front end caps (one inside the other) can be useful for really bright targets like a full moon (the moon is much better observed when NOT 100% full though) to make it easier on the eye. Just pop in the larger cap without the smaller one in its center
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