Best way to start from the beginning is.

1- choose a good farming class to fast progress through main quest
2- just do main quest and equip everything until you reach(black mane) boss to unlock trade shop.
With trade shop you can craft chest with black pearls that sells for 2billion silver
3-after you do all that and acquire the needed silver you can now begin on enhancing you gears to +40. With that silver you can buy Alot black stones on market to easily max your enhancement on all gears to +40.
Then buy mythical gears to get more cp for progressing main story.
Although This is just a small tip for a huge game that need alot of knowledge.

Thank you for reading, if in any way it helps you.
ING:xGrày
Region:NA
Server:Mediah

Added : you can get 40 to 60Billion silver in great ocean every week. Yes you heard it right, you need at least tier 5 ship and 3k cp ship above to have smooth/consistent farming in great ocean.

You need 10x padix pirate Island invitations to enter the padix Island, it's like boss rush after you finish you can get a good item that can be sell to millions. Every week you can get at least 100+pcs padix pirate Island invitation. Great ocean is great content, if you're low cp and depend on silvers for upgrading gears..then this content will help you gain so much silver..