1. I could not find any header pins where the I2C signals come out.
J3 has I2C signals brought out
2. It seems like the IO on this board is at 3V, is there any way to set it up to be 1.8V ?
Presently you would have to use the level shiftter to set it up 1.8V
3. Is this the right sequence to setup I2c
Does this blog help you ?