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Hi Hydra
That is a very basic telescope. It will not give really large views of Jupiter because there is not sufficient light getting to the eyepiece.
However if the telescope is polar mounted (the EQ1 main axis, RA, pointing at the south celestial pole). You will be able to see jupiter at a maximum magnification of around 90x with your 10mm lens. You could try the barlow with this to increase the magnification to 180x but I don't think the view will be as good. A good dark site will be needed to see any galaxies. I have seen some of the brighter galaxies with a 70mm telescope from a dark site but to find them you will need some practice at using the telescope and a star atlas to find them.
Try to join an amateur astronomy club and take your scope to one of their viewing sites. I am sure there will be someone that will help you to find objects with your scope.
Barry
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