1-I think that's ok for a begginer, I mean, when I had my Enchanter she used Dim Sword IV/Eventail, DPR and Magia Hood all with Max Hp+20%.
2-You would go with full Int-256 Dex-300+ Agi and Rest Vit.
3-We have 3 kind of Autoskill:
-Chance by Attack (When you attack)
-Chance by Defense (When you get hit)
-Chance by Evasion (When you evade).
You as an Autoskill Enchanter, you need many of Chance by Attack as possible.
4-It is not necessary to have all elements, you should make sets based in just one element, I would suggest for damage:
Dark (Expensive)
Gram-Frederico
Struggler ReUp-Dajarte
FaW-Dunkelis II
Specia's Blessed Stone-Dajarte and Agira Jarma
Dark (A bit cheaper)
Dim Sword IV-Gerust
Struggler ReUp-Dajarte
Doggy Ears ReUp-Dajarte
SBS-Dajarte and Mezzaluna
Earth (Expensive)
Earthquake Bell-Frederico
Struggler ReUp-Cherose
Sage Hat ReUp-Cherose
SBS-Cherose and Agira Jarma
And for defense:
Light (Optional)
Caliburn-Wizard
Struggler ReUp-Gewalt
Lucioscodo Up-Gewalt
Catura Talisman-Gewalt
*Dark set has the highest damage, so it is useful against all element mobs, except dark for their elemental resistance; Earth is the second highest, it is useful against dark elemental.