For your stats you will want just enough points into STR to be able to equip your gear and then you will fill out all the necessary points you will need to get your AGI skills and once done and after lvl 400 you can redistribute some of the stat points into ENE to pick up all of those skills as well.
You will want to prioritize getting all of your skills to max at some point but for starting out you can leave the top right two skills at level 1 and only put 3 points into soldier and blessing of the spirit
When we are talking about sets, you will benefit more from the Vicious family lineup as well as the Qiraji family lineup if you are using core pieces.
You will want to prioritize anything that benefits your skills or properties. No need in applying any that benefit your element.
Here are some build guides from the Top AGI Elfs