To get Silver in Lost Ark, you will need to kill enemies and complete quests. The more quests you complete, the faster you will earn Silver. After you get a sizeable amount of Silver, you will use it to create guilds and buy items, among other activities.
That said, if you are looking to farm Silver for whatever reason, your best move would be to start out small. Focus on completing every quest you can in the area you are in. Quests reward more Silver than farming monsters would. Farming monsters is probably the worst way to get Silver, as these will only reward 4 to 5 Silver at a time for around 5 to 10 minutes of killing monsters.
Related: What is the Power Pass in Lost Ark?
Dungeons are also a huge source of Silver and loot. Keep loot until you reach a city or village with merchants when you get loot that you don't want to use. It would be best to sell it off to merchants, who will get rid of the useless item and give you a small amount of Silver in exchange.
For more on Lost Ark, check out Where to find "A Stubborn Writer" Hidden Story in Lost Ark or Where to find "To Be A Human" Hidden Story in Lost Ark here on Pro Game Guides!