Aww shit, so it happened.
Step 1) “I would like to invoke my right to remain silent.” You must say this. Being silent is not enough, as backwards as that sounds. If you just remain silent, the police can literally sit and ask you questions for hours even though you are not responding.
Step 2) “I would like to invoke my right to an attorney.” This will prevent police from coming back to question you after they let you sit around for a while in jail, which they can sometimes get around if you invoke the right to remain silent. This will also get you an attorney to consult with/be present during questioning.
If you followed all of the tips listed in the LEARN Channel series, the lawyer will be in a much stronger position to get the charges dropped.