A thread about affixes : Dictionary & affix Descriptions
A thread about legendary items : LegendEx legends, for easy viewing
A thread about rerolling : Easier method for Perfect-Re-rolling
The most part of the mechanics are explained in these topics, but if you have any question, don’t hesitate, and ask 
There is many ways to play a character (even if there is only 2 class), everything is about the stuff you’re crafting/looting (for the legendary effects)
So you’ve to test them, find your favorite gameplay, and start crafting