Holding the oboe is a very important first step that all young students need to carefully work at. Hand positioning greatly affects how you play, so it is important to master it early on. There is one point that you make contact with the oboe that help with the balance:
Think about your right thumb as a brace rather than holding the instrument. Just let the oboe rest on the thumb.
Look at the images below to show you where to put your fingers.
Next, lets go to posture.