Your EQ needs can only be figured out by you. It's dependent on your install -- your speakers, where they're placed and how they're installed, and how they act in your vehicle.
The numbers are the frequencies you're boosting or cutting. You can choose which frequency your treble adjustment corresponds to, and which frequency your bass adjustment corresponds to. Do you also get to mess with the Q factor(basically, how the EQ boosts the frequencies)
Your speakers might have a dip at 80Hz, so you migh need to boost there. Or, you might not care about those frequencies as much, so you boost the bass down at 60Hz. Same with the treble, you just choose what frequency you want to boost or cut. Just do whatever sounds best to you.