It’s a substantial task…
You need to think of your code as ‘event driven’ rather than linear/sequential.
There are MANY threads on here about learning and implementing millis timing, but you need to take on the load ! 
It’s a substantial task…
You need to think of your code as ‘event driven’ rather than linear/sequential.
There are MANY threads on here about learning and implementing millis timing, but you need to take on the load !