Bring all the sheet music you possibly can to the first lesson
Make an inventory of all the pieces you’ve played
Finally, a good music dictionary for looking up terms is always a good idea.
Something else that I’ve seen the need for is an extra fine tuner for the A-string. I have one, and it has saved me more than once on stage, so please invest in one, and I can put it on in lesson if need be.
Recommended Violin Resources:
Johnson Strings is a really good place to go for fast service and reasonable prices: www.johnsonstring.com