Help with AR, ascended and fractals !
It can be a bit confusing in the begining yes, once understood though it’s easy.
Read up dulfys guide and you should be good:
http://dulfy.net/2013/11/28/gw2-agony-infusions-slot-and-agony-resist-guide/
With 2 rings and an amulet you will be able to reach 15 agony resist easy (10 is required for fractal level 10-19 content) and eventually 25 agony resist once your rings have the infusion slot (though you’ll be lacking the soulbound materials at first to upgrade your rings). Most people settle on getting +20 agony resist total from rings (10 each from +5 agony infusion and versatile simple infusion, though you could go higher).
From there aim to get the rest of the trinkets and eventually weapons. It will take some time though since fractal relics are slow to come by at lower fractal levels.
Best example:
http://gw2dungeons.net/Settings
Your AR + fractal level = agony dmg on the right side