If you are so newbie to such things and don't know anything, then you should try reading many of the helpful posts in here.
No offense but every time we answer a question a new question arise.
I mean you are welcome to post anything and ask any question but a simple search would have solved your problems and give you enough knowledge to everything.
Its really simple as this:
DT770 PRO-80: Require an amp to sound it's best, its told to be the bassiest between all of the other DT770s.
DT770 PRO-32: Does not require an amp though Its told to benefit from one.
DT770 PRO-250: DOes require an amp its told to be brighter than the others.
All those are bass heavy and have a decent sound stage.
HD598: does not require an amp though it may benefit from one.
DT770 closed vs HD598 open
everything is listed and summarized here. it doesnt have to be complicated.
Just pick the one that best suit you.
Hope I helped.
its not that im that newbie... i mean i am a little newbie but the harder thing about this is the lang berrier that i dont understand the word itself but when you say what it does i understand it better to what you mean...