Ah, the best medicine that is laughter.
We can't just snap our fingers, tell you to study a specific book or movie and then you'll be instantly funny.
For now, just steal other comedians jokes. Tell each anecdote as though it actually happened to you. It makes things more believable and when the punch line hits them, they're totally stunned.
If you want to be really funny, it calls for a certain perception of the world. You have to be able to twist the obvious and make a play on words.
Remember the words of Steve Martin:
A comic says funny things. A comedian says things funny.