I'm going to visit Melbourne in February. I was a Chinese student with an F-1 visa in the US. I charged with 4th-degree assault in Oct 2013 with a no contact order. Then, I broke the no contact order in January 2014 as well as gave false statements to the police. After 3 days, the police brought me to the court and charged me with two more sentences which are the making of false statements and breaching the no contact order, each with maximum penalties of 364 days in jail and $5000 dollars fine. I left the US in April 2014 and I have another charge for Failure to Appear in court as well as a warrant on me. I'm now in my home country (Hong Kong). As far as I know, I was not found guilty of the 3 charges (4th-degree assault, breach of no contact orders and false statements). I'm so concern about how should I answer the question, "Do you have any criminal conviction?" Should I answer yes or no? I will just be in Australia for a school trip. Also, will the above sentences be substantial on my criminal record under Criminal Law? How much will it affect for me to get into Australia?