Go King's Indian Attack! Amazing as an anti-Sicilian.
The Ultimate Anti Sicilian
Not neccesarily. White has a bunch of cool tricks he can play after 1. d4, Nf6 if black follows the main line of the King's Indian.
As for anti-scicillian I reccomend study the scicillian and keep playing 1. e4. It's not what I do (I'm used to 1. d4), but if you're used to playing 1.e4, you should stick with it.
yeah, the anti-d4 is Nf6