Welcome to Xen Rebirth (Xenepic Online Revo) Here's a video on how to start off in Xen! There is a detailed typed out version with screenshots if that also helps you. Good luck. An automated "show me where to go" animation will guide you where to go with just clicking on the area you need to go or you can use the map. (Be sure to do this fast when you start the quests).
THINGS TO KEEP IN MIND-
You can level your character to 16 to choose a class to continue your journey on (Acolyte/Cleric/Priest/Paladin, Apprentice/Mage/Wizard/ArchMage, Disciple/Templar/Holy Avanger/Saint Guardian, Neophyte/Rogue/Assassin/Shadow Master, Scout/Ranger/Archer/ArcherLord, and Squire/Knight/Warrior/Warlord).
You can reset your stats by entering the Essence Acolyte Guild (NPC Morphine) for free until level 20. https://www.xenrebirth.com/index.php?game-stats/
You can use this quest guide to let you do beginners quest to get you started after level 10. Beginners' Guide: Recommended Quests to Consider/Complete
Visit the General Merchant at any town to make juices.
You can choose from Oranges, Grapes, and Tangerines.
This lexicon entry talks about the different rewards you can get after beating a guild dungeon. You are able to get tokens and exchange them at the token exchange NPC at Tramis Mansion (Brynhilld).
This is the list of the locations of the Christmas Trees around Brynhilld and Essene. Login every day from December 1 to December 24 to get a prize in each tree.
I have added a screenshot and prizes to each of the Christmas Trees!
Arcarinas Square (Brynhilld) - 1, 2, 8, 14, 21
Guild Plaza (North Brynhilld) - 4 and 22
Tramis Mansion (North Brynhilld) - 5, 13, 17, 23
Mall Street (West Brynhilld) - 6, 11, 15, 20
Summerhill Street (East Brynhilld) - 9, 10, 18, 19
Essene - 3, 7, 12, 16, 24