It's bought a 2010 G35S sedan in a 6 speed MT. New to the Nissan world, came from the Subaru world owned two STi. Any tips or advice would be greatly appreciated.

 

Welcome to the site, nice that you're already coming from some sporty cars, those STis are a fun ride.
I'd just look through the various sections in the forum for awhile, particularly the sedan section and the Sedan "picture share" section, then if you need further help post over in the Sedan folder. Have fun and enjoy the ride!