Ive been playing the violin for over 18 years now and I am an expert, Are there any tips or things you would like to know about it? 
Wow that's a long time. I really wouldn't even know where to begin with that, it seems so complicated. 
Its not complicated,Since its the smallest and highest-pitched instrument it makes it very easy to use and learn, With regular practice you can learn how to use it in no time.