In Rohan, the skills for the knight are pretty easy to follow. While being a knight you will have more buffs than attacks, but that is for a reason. The attack skills that you will get as a guardian are far better than the ones available as a knight. Below is an example of skill build for the knight, it is possible for you to tweak it by a few points here and there, but this build is generally good as is.
Darkness - 5/5
Level(rohan gold) 5: Boosts Darkness Elemental Attack Rate by 100%, Defense by 50%. 8% chance of 30% drop in attack speed for 7 seconds.
Rising Might - 7/7
Level 7: 21% boost in your target's Strength. Lasts 30 mins.
Protection - 5/7
Level 5: 15% boost in Armor Defense Rate. Lasts 30mins.
Psychic Crash - 1/7
Level 1: Adds an additional 60% damage to regular attack on your target.
Crash Above - 7/7
Level(Rohan powerleveling) 7: 35% chance of a 3second Stun when Psychic Crash Skill hits its target. Lasts 90mins.
Sharpen Blade - 5/7
Level 5: 15% boost in the user's One handed weapon (except daggers) damage. Lasts 30 mins.
Invoke - 5/7
Level 5: With a successful Critical Attack, 470% of your Dexterity is added to your attack. PLus a 20% boost in Dexterity. Lasts 30 mins.
Bleeding - 1/7
Level 1: Adds 5 additional atacks every 3 seconds at 80% of regular attack damage.
Assualt Crash - 5/7
Level 5: Adds a 100% boost to Attack Rate. Applicable to your enemy at 100% of last damage, and 90% of damage to surrounding enemies. 7M range.