Venus is small and just a white ball when full or a crescent at other times. Jupiter should show bigger than a star although 700mm is not terribly long focal length for planet hunting, likewise the eyepieces you mention are not high power. But you should be able to see that Jupiter is a planet and the tell tail srtripes in the cloud cover. Try using the highest power (shortest focal length) eye piece you have and use a 2.5x barlow if you have one.
Best of luck
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