So, you want to be an Islander?

Well, here's the perfect roll you want.

Str X
Dex 4
Int 4
Luk X

Unlike off the Island, all you need is 4 accuracy to hit everything, which you can obtain with 4 luk and 4 dex. Having more in dex is fine, but Int should
be 4.

There are two standard builds for Islanders. The first would maximize your chances of one hit killing a monster by using strength and dex. With the standard 10% mastery, strength adds to your maximum damage while dex adds to your minimum damage. At some point, raising your strength will not yield a better chance of one hit killing a monster. The calculations supplied by Shoax(using a 38 attack purse)

For best chance of 1HKO Orange Mushroom: Cap at 205 STR, rest into DEX
For best chance of 2HKO Orange Mushroom: Cap at 100 STR, rest into DEX
For best chance of 3HKO Orange Mushroom: Cap at 65 STR, rest into DEX

The 2nd build would be to add to luk instead of dex, to take advantage of more avoid. Since a miss prevents knockback, it's possible that your beginner will be able to train faster.

Training:
I recommend getting the razor as soon as you can afford it. Its range is
pretty poor, but it's an ultimate shroom and snail killer. Keep the first weapon for the Orange Mushrooms, until you find a high attack sword. Around level 7 ~ 8, begin focusing on obtaining the drops you need to be the best-dressed and equipped character on maple story mesos (Side note for the jobbed classes, once you get mastery, strength adds
more to your minimum attack then dex does. However, with 10% mastery,
dex adds more to your minimum attack than strength)

Weapons

All Levels.
Sword - Snail and Red Snail (Look for w.atk 19)
Hand Ax - Shroom (Look for w.atk 19)

Sky Snowboard - Orange Mushroom and Red Snail (Limited time only)
Yellow Valentine Rose - All monsters.

Level 10:
Double Ax - Orange Mushroom(limited time only)

Level 12:
Red Valentine Rose - All Monsters(limited time only)

Level 15:
Leather Purse - Red Snail

Level 24:
White Valentine Rose - All monsters(limited time only)

Level 48:
Blue Valentine Rose - All monsters(limted time only)(Only for Godly Islanders)

Armor

Level 0:
Red Mini Skirt (F) - Snail
Yellow Cotton Shirt(F) - Red Snail

White UnderShirt (M) - Snail
UnderShirt (M) - Blue Snail

Leather Sandals - Red Snail

Level 5:
Green Headband - Snail
Blue ClamDigger's - Shroom

Level 11:
Red-Striped T-Shirt (F) - Blue Snail

Blue One-lined T-Shirt (M) - Blue Snail
Gray Thick Sweat Pants (M) - Blue Snail
White Gomushin (White Korean Rubber Shoes) - Orange Mushroom
(The White Gomushin is like haste for n00bs)

Level 15:
Amethyst Earrings - Red Snail

Level 16:
Ice Jeans - Snail and Shroom

Usable Items that can be used with the limited number of Island Items:
Scroll for Helmet for Def. (10%) - Snail
Scroll for Shoes for Jump (10%) - Orange Mushroom
Scroll for Helmet for Def. (60%) - Orange Mushroom

You can also barter a brown or green skullcap or a red, yellow, green or blue headband from the pre-jobbers doing the "Bring this letter to Lucas" quest. If you made it to level 10, you can also party and train pre-jobbers in exchange for these items.

I'd recommend some training areas, but I guarantee by level 15, you will have been over the Island many, many times and know it all by heart.

Congratulations, you're on your way to becoming king of the Island.