There is not hard and fast rule when it comes to EQing your sound, as it is a matter of personal preference.
I don't believe in the "one EQ setting fits all" approach, thus I will only provide you some simple tips:
1) Try to hear in your head the sound you want to end up with
2) Start with a flat EQ to hear the base sound of your guitar and the amp, as no two amps sound exactly the same, given many factors like year of make, venue acoustics, how hard it has been played over the years, etc
3) Play around with the individual EQ sliders (for graphic EQ) or knobs (for parametric EQ) to see what they do to the sound. Test the sound of the sliders or knobs at their extremes to see how they affect the sound, but only do it one slider / knob at a time. Always set it back to flat before you go on to the next slider.
4) Once you've more or less figured out what each knob does to your sound, you can slowly try and use the EQ to get the sound you want. Be patient with it, because you won't get it overnight. It takes a lot of time, I've been playing for 6 years and I'm still learning.
5) Enjoy your sound.
Remember, don't be lazy and memorise the EQ setting to use for every place you play at, because it'll usually sound different. the same amp in a different place may sound different. Hell, the same amp in the same place, on a different DAY may sound different. There are many factors in play when it comes to sound.