Technically I'm an astrophysicist/astronomer by trade, so I can offer a few points.
A telescope has two purposes: gather as much light as possible to give a brighter image, and magnify.
This telescope has a fairly small aperture of 80mm, so it's not going to be gathering much light so it's not going to be very bright. It does, however, have a reasonable focal length which is what gives the magnification. Together this means your telescope is going to be best looking at bright objects that need to be magnified, so planets and the moon.
Venus and Jupiter will be your best targets at the moment. Venus is fairly featureless to look at due to its highly reflective cloudy atmosphere, but you should be able to quite clearly see its crescent shape. Jupiter is quite an interesting one to look at, particularly the moons. The four Galilean moons should be visible, and over the course of even a few hours you can see how they move around the planet. You might be able to see some faint banding of the clouds, but that might be slightly beyond the capabilities of the scope. Similarly, the Great Red Spot may also be just about visible when the timing is right.
The moon should be pretty spectacular, especially at the moment while it's a fairly thin crescent which means a lot of shadows from the craters which really show the texture well when properly focused.
The small scope on the side is called a finder scope, once you have something centred in the main scope there should be a couple of small adjustment screws on the side of the finder. Centre the crosshairs on where the main scope is centred and the low magnification of the finder makes it much easier to point it accurately at things.
In terms of stars, even with the biggest scientific telescopes they're still just pinpoints of light. There are some cool binary stars though, especially Albireo in the constellation Cygnus. It's two stars at very different temperatures, and you should be able to see one looking golden and the other blue. The Orion Nebula in the sword of Orion may also be interesting to look at with a scope like yours. Some of the brighter globular clusters might be worth a look at, for example the Hercules globular cluster. The open cluster of the Pleiades might look nice as well. But with the fairly small aperture of your telescope, it's only the brightest objects that will be worth viewing.
Any questions let me know!