It's called a year of coming on once a week to collect and deposit money from/into the miscellenia coffers. If you finish Throne of Miscellenia and Royal Trouble, you can pretty much make 500k to 1m a week doing nothing.
I put my resources in 100% Flax, and 50% coal.
Also I have 83 mining, and all my other money skills are 60+.
Just stick with a money skill, and don't get distracted.
Also for the bando's tassets, I bought em when they were 11m