Default [Q] S3 I9300 4g lte

Hey guys,
Little help required n a big favour
Recently i purchased Galaxy S3, the model number says its i9300 n on its back cover 4g lte is mentioned, there is also an antenna on it. It has 2gb ram. N surprising it was rooted.
Its baseband says i9300zsema2.
Now i just wanna ask
1. How do i install custom recovery on it???
2. Which custom rom i can install on it??? I93100 roms or I9305 lte roms???

Hoping for reply thanks

XDA ROCKS :P