Heres an Assassin Guide, I hope you like it... Credits to Whitelight3r, as usual =)
Dice Rolling
STR: 4 (Never add any AP into this)
DEX: ? (Doesn't matter as long as you have 4 STR and 4 INT)
INT: 4 (Never add any AP into this)
LUK: ? (Doesn't matter as long as you have 4 STR and 4 INT)
Once this is done enter the game and continue to play but make sure you read the rest of this guide first!
Ability Points
If you are just creating your character read "5) Starting" if not here we go.
Assassins ability points should only be put into LUK and DEX, LUK is the primary ability point and DEX is the secondary. You only have to worry about what your DEX is, if it doesn't go into DEX it goes into LUK, remember this. The Following will tell you how to spend your Ability Points.
Level 1 - Level 9: Green Snails (3 EXP).
Level 10 - Level 14: Slimes (10 EXP).
Level 15 - Level 19: Orange Mushrooms (15 EXP).
Level 20 - Level 24: Kerning City Party Quest (5000 EXP est.), Pigs and Ribbon Pigs (15-20 EXP), Octopus (24 EXP).
Level 25 - Level 29: Kerning City Party Quest (5000 EXP est.), Bubbling (26 EXP), Green Mushrooms (26 EXP), Green Mushrooms and Horned Mushrooms (26-35 EXP).
Level 30 - Level 34: Green Mushrooms and Horned Mushrooms (26-35 EXP), Jr. Sentinel (40 EXP), Horned Mushrooms and Zombie Mushrooms (35-42 EXP), Wild Boars and Jr. Boogies (42-150 EXP).
Level 35 - Level 39: Ludibrium Party Quest, Jr. Sentinel (40 EXP), Horned Mushrooms and Zombie Mushrooms (35-42 EXP), Wild Boars and Jr. Boogies (42-150 EXP), Evil Eye and Jr. Boogies (50, 150 EXP).
Level 40 - Level 49: Ludibrium Party Quest, Evil Eye and Jr. Boogies (50, 150 EXP), Brown Teddy (60 EXP), Dark Axe Stump and Fire Boar (38 EXP)(60 EXP), Ratz (65 EXP), Jr. Grupin (65 EXP).
Level 50 - Level 59: Jr. Grupin (65 EXP), Fire Boar and Copper Drake (60, 105 EXP), Curse Eye and Fierry (70, 120 EXP), Platoon Chronos (99 EXP), Blue Mushroom and Stone Gollem (32, 170 EXP), Curse Eye and Dark Stone Gollem (70, 200 EXP), Lorang (80 EXP), Zombie Lupin (90 EXP), Cold Eye, Drake, and Cargo (85, 135, 240 EXP).
Level 60 - Level 69: Curse Eye and Dark Stone Gollem (70, 200 EXP), Lorang (80 EXP), Zombie Lupin (90 EXP), Cold Eye, Drake, and Cargo (85, 135, 240 EXP), Jr. Yetis (135 EXP), Coolie Zombie (190 EXP).
Tips and Techniques !!
Low DEX Assassin
Low DEX Assassins spend less points in DEX and end up putting more in LUK raising their damage. Most of the time they scroll their Overalls, Capes, and Shoes with DEX scrolls so they can still wear their clothes.
Low DEX Assassin Ability Points
This is actually very simple, all you have to make sure is your clothes give you enough DEX to wear your next level equipment/weapon and everything else goes into LUK. If you're level 49, about to turn 50, even if your level 50 clothes give DEX you cannot access that DEX until you have the required DEX from other things you have on and ability points spent into DEX.
Garnier!
Garnier is your level 10 claw, if you're unfunded you can use this until level 25 when you should upgrade to your level 25 claw, the Meba.
Throwing Star, Throwing Star, Throwing Star!
Make sure you have enough sets of stars to train without having to return to town every minute.
Meba!
Meba is the fastest claw in Maplestory, take advantage of this and use it until level 40 when you an upgrade to another claw.
Potions
Try and use orange potions and blue potions for as long as possible, because you pay extra mesos the better potion you get.
Jump Shot
Assassins can jump and shot with range while in air, other classes have trouble doing this, you can use this to jump over monsters and avoid punching them with your claw.
Backshot
Assassins can jump and turn around to attack and continue moving around. If you do not mastery this technique you will not be successful in using an Assassin.