There have been a few Bond of Friendship decks been published recently, so I thought I'd have a crack at it too.
Erkenbrand forms the cornerstone of the deck - prioritise readying and defensive attachments for him, and you can effectively stall until you find the rest of the pieces you need to beat the quest. Galadriel helps in this because she maintains your threat barring any quest/encounter effects, which is necessary given the high starting threat of 34.
Eowyn and Haldir are just very solid pieces to have in any deck - threat efficient for their stats, and bring some unique and useful abilities to deal with enemies that are particularly useful in the early game.
Steward goes on Erkenbrand as well to be able to use Heed the Dream, and then extra resources can be farmed out via Errand Riders. It also means you can get out Ancestral Armor onto him more easily which is crucial for some of the higher attack enemies.
Between Galadriel, Gleowine, Legolas, and Steward of Orthanc you should be able to get through your deck in a reasonable time, but there is also Heed the Dream and Peace and Thought to help that along. Peace and Thought in particularly strong given Galadriel is going to exhaust to draw a card anyway, and Haldir's action can be given up for a turn without too much of an issue once you have any level of board control.