I've been trying to use the I2C on Vocore 2 to get data from an accelerometer, two IR sensors, one light sensor, one temperature sensor and one Ads1115 module to get readings from analog pins. BUT I DON'T EVEN KNOW HOW TO START!!!

Could someone please help me by giving the direction?
I already installed i2c-tools on Vocore 2, but I can not understand how does it work.
Could someone indicate the way?