The nearest Birch trees are around the pond to the east of Trent. They are partially in the water and sometimes hard to harvest but the ones on the north side are easier to cut.

Cedar trees are just north of the same pond to the east of Trent, close to the rocky slopes.

Easiest to take your own birch and cedar logs sufficient to make 3 planks (15 maximum each) then use Processing > Chop to make the planks once you have the quest.

¿Porqué no me da la mision?

Bu görevi yapabilmek için gereksinim vardır ve bunu kara ruhu çağırıp rehberi seçin. Rahberde kesme kısmından bilgi edinmeniz gerekli. başlangıç kesme bilgisini aldıktan sonra yapabilirsiniz. Rehber size yönlendirme yaparak ilgili NPC ye yönlendirecektir.
https://bdocodex.com/th/theme/6560/

CORRO

Have knowledge (H / Life Skill / Certificates): "Chopping: Beginner"
Otherwise learn the processing skills by talking to the Chief in Velia Igor Bartali (https://bdocodex.com/th/npc/40724/) and afterwards with Ficy (https://bdocodex.com/th/theme/186/) in Heidel.

What Tim wrote is correct, but how you get there is not.

To get the knowledge "Chopping: Beginner", which is needed to even see the quest above, you need to finish the quest The Most Annoying Bird at Alejandro Farm west of Heidel (it's the third quest in a quest chain starting with Cook at the Heidel Northern Post, unless they changed it and you can just accept it at the NPC Gurceau at the farm). After that, Gurceau asks you to collect 3 pumpkins and deliver them to Ficy in Heidel.

This opens up the quest [Processing] Learning Higher Processing Skills. You then need to do three fairly annoying sub-quests, but once you complete those you are done and can finally accept [Processing] Trent Worker Experience? at the Spotty Troll in Trent for your wonderful one inventory space. Hell yea.