There's nothing wrong with not making noise. Some people do, some don't.
Yes, there is a difference between having an orgasm and ejaculating. Most women can orgasm, but very few women ejaculate. Right now, it isn't proven that all, or even most, women are capable of ejaculating, but most of us can orgasm. Women usually orgasm from clitoral stimulation, so some women do find it difficult to orgasm during vaginal sex.
Since women don't usually ejaculate anything during sex or orgasm, the fluid you see after sex is probably just your own lubrication or his semen. We produce a lubricant when we are in the mood whether we orgasm or not.
It sounds like you two should explore your body. You could start with masturbation. Feel around, see what you like, see what feels good and what doesn't feel like anything. Try to bring yourself to orgasm. After that, you can apply what you learned to when you two are together. Guide him if you need to. More women orgasm from oral sex than from manual or vaginal, so you two could start there.