Congrats! It's a good kit to build for sure! Just be mindful of the type of plastic in an individual sprue, they use both styrene and ABS, but it's listed as to what it is on the back of the sprue letter plate.

Here's Yevgenyi's link to a good sight for the IS 2:

http://legion-afv.narod.ru/IS.html

IS 2 is in the bottom section as you scroll down on the left.