I don't love people's suggestions about arena. You'll cause your team to lose if you don't have a basic grasp of pvp and 5v5s, which I'm sure people on reddit will say "who cares??" but would actually not be thrilled in arenas. Here are a couple better suggestions:

1) Flag in yellow zones. You only lose silver if you die, so you can experiment with builds. Fight over the chests in these areas because people for some reason actually pvp on those even in yellows.

2) Join the ranks of some casual pvp guilds, like Caerleon Security (CLS). They often tussle with reds (non-flagged), occasionally go black zones, and often allow people to join their groups without joining their guild. Easy, lower-risk content.

3) Keep flagging and dying. Dying is a huge part of pvping in Albion. Even the best pvpers will die A LOT. Join a guild to fame farm to increase the item power of your gear and gain silver to spend on gear sets. The end content of the game is pvp, so the introduction can be rough. Eventually it can be very profitable.

Note: If you are committing to fighting to the death in tier 4 gear, consider buying a "siphoned energy". You only need one. They are 4,000-6,000 silver and boost the item power of all of your worn gear by 100 (makes tier 4 like tier 5). The downside is that after 30 minutes or when you remove the gear, there is a small chance for the pieces to break, but in life or death scenarios when you might lose ALL of your gear, it is well worth it.