I didn't write this, but I searched for this and nothing came up, so here goes.
Requirements:
* Leather working level 115+
* Either a level 45+ character or some money to start buying mats at the AH.
* Recipe for Deviate Scale Belt (or money to buy it)
If you have some money, you can buy Perfect Deviate Scales for around 1g each.
You need 6 of these to make a Deviate Scale Belt, so let's say 6g
Then you need 4 Deviate Scales, which can be bought for around 1g total.
So around 7g total.
A Deviate Scale Belt is great for 19 twinks and therefore has a high price at the AH. On my server they sell for 15-30g, which is a good profit.
If you don't have any start money you can grind some Perfect Deviate Scales from Willing Caves. You may want to use a higher level character for this, but yeah.
If you don't already have the recipe for the Deviate Scale Belt it can be bought for around 1g from the AH.
1.Repeat
2.??????
3.Profit