Choose an early hunting route that fits your class and the support you have.
Start with how your class deals damage. Abandoned Camp is an option for fighters and mages. A support with Disrupt Undead can target undead in Execution Grounds; without that attack, consider joining damage dealers. For an additional objective at Abandoned Camp, speak to Leopold in Gludin about Vanquish Remnants.
With suitable buffs, consider Partisan's Hideaway. Casters with less support can look at Fields of Silence; Black Swan, available from Gosta in Heine at level 32, adds a quest objective there. Execution Grounds also remains an option for undead specialists. If you plan to take Hunt of the Black Lion, complete Vanquish Remnants first.
Vanquish Remnants starts at level 21, so reaching level 20 and completing the first profession does not immediately satisfy that quest’s level requirement. Check the active quest step before a hunting session and return to its NPC when the objective is complete. Treat the route as a way to combine suitable monsters and quest progress, not as a guaranteed speed-leveling schedule.