You need to be feeding it rabbit pellets and hay. Foods like you mentioned are treats, not a main diet.
Do NOT bathe a rabbit! They can get pneumonia extremely quickly if they inhale any water at all. If the rabbit isn't clean something is wrong with it or its housing.
Also, rabbits need lots of interaction from a human, like dogs, and a large play area. You can't just stick one in a cage alone and expect it to be happy.
To tell male from female, gently turn it on its back and see if it has testicles. If it does, it's a male. Put it down immediately after, though, rabbits don't like being held on their back and can't breathe right that way due to how their frame is set up.