great question !! think of it a bit like driving your car -- you have a speedometer that tells you how fast or slow you are going.
so with blood testing definitely in these early days you want to know what all the different kinds of food do to your levels
I normally test at least 8 times per day as follows
immediately on waking
before brekkie ( usually an hour or 2 later )
2 hours after eating
before lunch
2 hour after lunch
before dinner
2 hours after dinner
before bed
i also test immediately before getting behind the wheel of a car to drive
you may need to get more strips than you have been prescribed but we can worry about that if you run into any issues ( no point worrying before we need to

)