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Hi Amy
Well done on getting Jupiter. Although planets are large they are a long way away so appear very small. Jupiter shows the largest disc of all the interesting planets, it is still fairly small. At the moment the disc is about 30 arcseconds wide. To give you an idea the full moon is about 30 arcminutes wide or 60 times larger to the eye than Jupiter. Even at opposition in March next year Jupiter will reach just under 45 arcseconds wide.
Aso at the moment it is only visible low in the west where you are looking through a lot of atmosphere and turbulence so now is not the best time to try for it. Having said that a 6" f6 scope should easily show the cloud bands and when conditions are good the Red Spot. All 4 moons should be easily visible.
Saturn is still better placed at the moment but it is getting lower late in the evening. Again the rings will be easy to see and in good conditions, Cassinis Division should be glimpsed.
With eyepieces, a 10mm in your 750mm focal length scope will give 75x (750/10 = 75) which is moderate power in a scope of this size. As to whether an eyepiece will fit your scope, that depends on the size of the focuser. Most focusers take either 1.25" or 2" eyepieces (some take 0.965" ones but they are very rare these days). Usually a 2" focuser will come with an adaptor to allow use of 1.25" eyepieces, if there is no adaptor, odds are it is only 1.25", which is often the case with smaller less expensive scopes. Or you can simply measure the diameter of the focuser tube.
If it is 1.25", any eyepiece with that size barrel will fit it.
Higher power eyepieces have shorter focal length, so a 5mm one will give you 150x (750/5 = 150) BUT remember that higher power also magnifies any atmospheric distortion and make objects move out of view quicker so think carefully before spending cash.
My usual advice to new telescope owners is to make use of low power` eyepieces first, so do you have any others apart from the 10mm?
Malcolm
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