http://www.swstrings.com/Store/Shopping.jsp?Category=Instruments&SubCategory=Violin&Group=SV120
Can I put different strings on this electric violin?
Yes, you can. Many electric violinists use D’Addario Helicores. These can be used for acoustic violins too but they sound quite good on electric violins.
http://www.amazon.com/DAddario-Helicore-Violin-Medium-Strings/dp/B0002D08OI
Ask what sort of strings are on the violin when you get it. I assume they would be Yamaha strings :
http://www.yamaha.co.jp/english/product/strings/silent_electric/silent_v/sv_120.html
An excellent resource for your violin lessons need.