Remember to study for yourself how your character works, the build really is dependent on your playstyle.

Mage skills are more powerful now that the level gap system has been reworked so you'd be dealing a huge amount of damage even if your INT is not too high. The damage of a 80 INT mage compared to a 90 INT mage is unnoticeable and negligible but the HP and Defense of a 50 STA mage and 60 STA mage may spell the difference between death and success. A STA>INT mage build will have an easier time levelling up - trust me.

I was a INT>STA build prior to Ver 5. You can do this before Ver 5 because you can use food pots easily and continously. With the cool down implemented on food pots, STA becomes an extremely important attribute for all classes.

Now, after you've job changed from mage to elementer it will really be up to you to decide if you'd like to pump your INT or STA more. If you're unhappy with your damage dealing capacity increase INT but if you're okay with your damage dealing but unhappy about your mobbing capability increase STA.

Of course, you also have to take into consideration that it will be easier to pump up your defense rather than your INT. The only way to increase your mp and your int will be through accesories and cards. Your defense may be pumped by accessories and cards as well but refining your armor will only increase your defense thus giving you the potential to bloat your defense through equipments far more extensively than your INT.

Try to consider these factors as you build up your character. Try also not to pool in your Ability points on one attribute all at the same time. Experiment. Try putting two points into STA and two points into INT and fight a monster and see how the changes affect your character. Lastly, go with what you feel is right. Try to take advise into consideration but remember that you'll be the one playing the character so advises and guides can only take you so far. You have to decide for yourself. Good Luck.

Weapons:

Wands - Ranged and Charged Magical Attack (Never misses), Increased defense (Because you can equip a shield) but no bonus for spells.

Staves - Melee Physical Attack, Weaker Defense (Absence of shield) and Bonus for Spells (increased damaged).

There is no better weapon. It really depends on your play style. Those who tend to cast spells to kill enemy monsters use staves. Those who tend to cast spells and attack use wands.