mastering meters, lufs, i need help

[mstojano]

so, i know a bit or two aboiut levels, lufs, mastering, loudness war...

heres what i dont get, what should i aim for to be safe?
hers a picture from one of my sessions, could someone explain me what are the relevant numbers and where to keep them?

the screen shot was done after i played the whole song through the meter
https://drive.google.com/open?id=0B5...m1kTTdjcTJVNmM

also i found this link http://www.pro-tools-expert.com/home...ing-using-lufs
any magical number to make everyone happy?