Hey friends! Welcome to my quick Seeker guide! This build will allow you to make an extremely well-rounded healer that also contributes greatly to the team's damage output.
Always begin every encounter by applying Janice's Rage then Time for Punishment then Deadly Marker. All three together greatly increases your team's damage output. The damage rotation goes as follows...
Use Strafing twice, followed by Zephyr's Knock into the last Strafing stack. Then use Brutal Arrow into Zephyr's Knock again into Decisive Sniping into Zephyr's Knock again. It becomes pretty free form after this but you want to use Zephyr's knock in between your abilities to make use of those Gale stacks for more damage, and after two uses of Strafing for Gale stacks and CDR. Not only does this combo flow really well, it's also incredibly flexible and does great single target damage. Remember, the best way to heal your allies is to kill the enemy faster!
Swift healing and Healing Touch + Nature's Blessing gives you big bursts of healing on single targets. Nature's Blessing, Flash Wave, and Fountain of Life take care of your AoE healing needs. Nature's Blessing and Fountain of Life both restore mana so don't be afraid to use them liberally. Try to use Janice's Rage in tandem with your debuffs for maximum damage. If you begin to run low on mana just slow down your damage rotation and make sure to stand in your own Fountain of Life.
If you need more condition cleansing, feel free to pick up Purifying Touch. If your team is still struggling with healing, you can lose Janice's Rage at the cost of your team's damage output.
Have fun and enjoy!