Honestly was quicker than I thought it would take.
Here are some tips I used, even for those who want to avoid the PvP aspect.
Make sure you play a least once a day. After daily reset first Plunder quest gives you an extra 800 Plunder.
Land in a Quarry (make sure to land on a rare as you will instakill it). Group everything and AoE, open every chest, kill every rare. Then move up to the castle, and do the same if there is anything left.
This nets you around 700-800 plunder (not including the daily quest). Then from there you should be level 7-8 and can either go fight or just keep looting.