Well.. any tips on warlock for someone who's never used a caster? :D
well obvious tip, only use vita/int

max mana is good level 1-15, trash any later than that.
I have spares you can have for free (usually around 100ee) on levels
Heals:
t3
15
20
25
30
35
damage charms:
t3
5
10
15
20
25
30
45
55
Magical nightshade padded robe
Level Req: 35
Physical Defense: 0 to 33
Magical Defense: 23 to 57
+36 Intelligence
presuming you probably got similar to these as they're low level and easy to get hold of:
Angelic woolen robe
Physical Defense: 0 to 4
Magical Defense: 6 to 18
+291 Max Mana
+1 Critical Strike
+2% Magical Damage Reduction
+1% Earth Mastery
Rare linen robe
Level Req: 5
Physical Defense: 0 to 6
Magical Defense: 8 to 24
+398 Max Mana
+2% Wind Mastery
Mystical elm staff
Damage: 12 to 32
+14 Intelligence
+1% Lightning Mastery
+2% Earth Mastery
don't have too much other random staffs/robes.
lemme know what you need as this is all just using up space tbh. I have my own caster gear, could probably lend an "ok" staff until you can find better
Warlock is generally a nice enough class that you won't need anything spectacular anyway. although 75+ can be a bit of a grind.
would recommend doublecast/powercast as your main skills, multicast whilst super cool isn't actually overly effective in solo.