Monster Hunter Online Guide: How to Make Money in the Game
Use all daily hunting tickets
Hunting ticket (狩猎票) is your certificate to enter hunting zone and it's a valuable item for hunters. Everyday you get 10 tickets (you can also get hunting tickets from events and cash shop) so make sure every time you enter hunting zone you sweep all herbs, mines, fruits, bones you can see in the map first and then move to your hunting target. The materials you gather may not be what you want, but don't worry, they can be sold in auction house in the town of梅杰波尔坦.
These are the most difficult daily missions you can do. They require you to do various tasks such as capture, sabotage, knockdown, and limited time quests, etc. Two difficulties can be chosen: hard mode rewards you tradable gold coins while easy mode rewards you non-tradable silver coins. So choose wisely.
Usually side mission gives a good number of silver coins. Unfortunately, unlike other MMORPGs, Monster Hunter Online doesn't have a lot of side missions.