So it's first time i play! Everybody tells me to build a Barbarian! Axe mastery and plate mail!
I should just put 50 dex rest all str? And as equip i should get an axe with big ed and an armor + char with lots of str? Is this all i need to know? Already my char is lvl 25!
What should i do more?

keep your dex about 30~ points under str with equipment worn

that should work