Regarding searching for gold, when I started the campaign I went to Big Boy for 5 months and gathered a large amount of gold and boxes, also some boxes of fortune.
In the campaign I recommend playing only the Big Boy level to advance since in the time I played it I gained rank 10, not to mention that some fortune boxes can give premium.
It is a useful technique for all players, plus everyone is guaranteed to win something in one day.
Exactly the most important thing is to have fun knowing that it is a game, I am currently focusing on completing the 2v2 campaign