TIER 2 AND 3 CRAFTING
The best schematics in the game after reaching Skyhold, can be found in the Hissing Waste Merchant (west on map, between two camps) and the Emprise Du Lion merchant at Suledin Keep. Crafting these items becomes incredibly easy, once you start farming for the correct resources.
Hissing Wastes sells armour schematics with the best costing upwards of 8000, while Suledin Keep at Emprise Du Lion sells weapons, with the best upwards of 6000. Unfortunately, to unlock this merchant at Suledin Keep, you have to complete most of the quests and the enemies in this area are upward of Level 15.
As soon as you reach Skyhold, I would recommend unlocking the Hissing Wastes and Emprise Du Lion maps with your Power. You'll need 40+ Power to do this.
Other great areas for Rogues are The Western Approach and Forbidden Oasis. They have Paragon's Luster, which is a medium armour rating metal that will allow you to craft better weapons and armour. For easy to find high armour rating, look for Dawnstone in Emprise du Lion. (Thanks for the tip, rynas!) In addition, there are Quillbacks, Hyenas and Phoenixes that all grant incredible bonuses for Rogues. Alpha Quillbacks are a little more difficult to defeat if you're only Level 10-11 so approach these with caution. The others, however, are very easy to defeat.
Quillback Leather - Tier 2 Leather. Medium Armour Rating.
Utility: 1.5 Cunning
Offense: 2.5% Critical DMG
Defense: 1.5% Ranged Defense (Great for Archers)
Phoenix Scales - Tier 2 Leather. Medium Armour Rating.
Utility: 1 Dexterity & 0.5 Cunning
Offense: 1.5% Chance to Bleed on Hit (Bugged - this does not work)
Defense: 1.5% Chance to Bleed on Hit (Bugged - this does not work)
Unfortunately, they don't drop as much resources as Snofleur and the Bleed on Hit bug makes Phoenix Scales almost useless, outside of the Utility Slot...
RESOURCE FARMING TIP:
In the starting camp at Emprise Du Lion, head north west to the frozen lake. You'll find plenty of Snoufleur there. They are level 12 and have roughly 250 HP. As a Rogue, they are very easy to hunt. Especially if you are, or have an archer. They drop anywhere between 2-10 Snofleur skins, which not only have great Rogue stat boosters, but can also be sold for 15 gold. In addition, the leather REMOVES ALL CLASS ARMOUR RESTRICTIONS when crafting.
Additionally, you can find Snoufleur's outside main camps in the Exalted Plains.
Snoufleur Skin - Tier 3 Crafting Leather. High armour rating.
Removes all class restrictions.
Utility: 1.75 Dexterity
Offense: 3& Flanking DMG Bonus
Defense: 3.5% Cold Resistance
Farm and sell, but as a Rogue, make sure to keep some for yourself. In addition, Silverite can also be mined from Emprise du Lion, which is a metal that also removes class armour restrictions. If you want to wear heavy armour, this will allow you to do so.
Finally, there are many Dragonlings, Level 12, in the north of Hinterlands that provide great drops. Just don't fight the Frostback and they'll continue to spawn. However, this may be difficult as the Frostback continues to blast fire down at you.
Once you unlock the Emprise du Lion Resources Operation, though, farming Silverite should be a little easier, depending on how much time you have. Following this guide, you'll be able to have high armour rating at levels as low as 11. With the right Fade Touched materials your equipment becomes even better, making the mid-game easy for Rogues.
Some recommendations on Fade-Touched materials:
Obsidian = 3 Guard on Hit. (Found in Redcliffe, behind locked door. Can be exploited. For more info, check here.)
Snoufleur = Heal 1% on Hit (will get while farming in Emprise Du Lion)
Phoenix Scales = +20% DMG if not hit for 5 Seconds (will get while farming in Western Approach)
(Plush and Faustian) Velvet = 10% Chance to use Hidden Blades