Valheim Plains guide: How to prepare for the Plains
Source: Valheim Wiki
The Plains are deadly, but you'll have a much better experience trying to survive in it if you come to it prepared. Here are some of the supplies and pieces of gear that we highly recommend you bring with you on your first trip.
You're going to want a full set of wolf armor, a drake helmet, and an upgraded silver-tier weapon and silver shield. All of these recipes mainly require usable silver, which you can make by mining and smelting silver ore from the Mountain biome.
Maces are great in the Plains since their high knockback can help with crowd control, which you may need when fighting Fuling groups. Atgeirs are a good option as well, as they have excellent range and their special attack does sweeping area-of-effect damage. They are weak against the Plains boss, however.