Yeah you can't play this game solo anymore, either play with friends or run your own party. All you need is 2 account at the minimum.
[You can get your first d-grade easy]
1. Make new account to get the newbie pack. Put it on a fighter -> knight path. The knight armor mastery adds 50 p.atk and atk.speed when hit by enemy.
2. Your 2nd account to be a mage, don't really need the newbie pack on this one. Mage -> wizard.
3. Get your party to level 20 and find a good spot at AC.
4. Setup your macro and sit back...
[Macro]
Wizard - This guy will be the one targeting. Summon your servitor it'll cost you 2 spirit stones each time.
1. Make a new macro, for the first line drag your Group Heal Lv1 into it. Then fill all the rest of the lines with /summonattack.
2. Put this macro into your [Auto Next Target] window. Activate by right clicking. Also pick short or long distance targeting accordingly.
Knight - This guy will be the main damage dealer. You want to only assist the Wizard's target so you don't go wondering off and getting stuck.
1. Make a new macro and have the following: /target (Wizard's Name), /assist. /attack, /pickup
2. Drag this to your shortcut bars, and right click to activate. DO NOT use [Auto Next Target] for the knight.
The best spot to use this setup is on the Ol Mahum Commander or mobs that spawn in a small area.
[How to get C-Grade Duals]
You can get a c-dual all by your self. When you earn enough money buy 2 Sword of Revolution and you can put it together using 20 Stone of Purity. You can easily get the SOP by using your Clan Coins which is earned upon reaching level 20. It cost 3 coins to get 1 SOP so one level 20 will only get you 6 so just repeat it a few times.
When you have the 2 swords and the SOP ready, head on over to the blacksmiths in Dion or Giran and make your C-Duals.
[How to get B-Grade Duals]
This is a bit more tricky, you'll need a Warsmith at level 40 or higher so you can crystalize D and C grades.
To get a level 40 dwarf you can use the above method, just replace the knight with your dwarf. After leveling at AC until 35~38, move into Ant Nest until 40.
You'll need to have acquired 2 C-Drade Duals, 4 Sword of Revolutions, and a "Dual Weapon Crafting Stamp". You can only get a stamp if you own a castle or buy it from someone who does.
Crystalize all your swords and purchase 2 Sword of Delusion from the Luxury shop in Giran. You'll also need 40 SOP and an extra 250 C-Crystals or so. Head over to the black smith in Aden and get your B-Grade Duals.