Lightning sorceress

Hi,
I am starting a sorceres for the first time. Any advice on how a lightning sorceress should manage lightning immunes?? Should I put some points in an other skill (cold or fire) or get something with a specific item?

Also, I wanna put the point as possible ins strengh, but it not easy to get enough to wear gears. Any advise on on many point I should put in strengh and easy wait to raise my strengh with items?

Thanks!

 

First, make cold sorc, its much easy to farm in start, go cows/travincal example, collect all gems put in bags, and sell to others, for light sorc your main goal is to make infinity rw ant put on merc, it needs 2 bers ist and mal runes, when you make infinity, reset skills ant stats to light sorc, because if you dont have infinity and light sorc will be hard