Hi,
I have 3 goals
1) long rides
2) hard rides
3) multi-day riding
I start building up mileage. This is also called base training.
I mix that up with shorter rides on hilly terrain. At some point I
start adding days of riding. I will commute a day, next week two days, etc. WHen I start in daily, I cut the miles per ride way back
until I get used to it.

There is no magic here. You just ride, some days you do one kind of ride, other days you do something different. The biggest problem I have is to avoid overdoing it.