hey again, and again i'm 4 months in too.
don't worry too much about what you're eating at this stage, just avoid refined sugars. and for now only eat at mealtimes.
most important thing for me was getting my basal (bedtime) insulin correct. the hospital started me on 20units levimer which i slowly brought down to 13units cos i kept going low in the night. i did this by checking BG before sleep and when i woke up, and occasionally in between (in the am) (+ don't eat for 4 hours before sleep when adjusting cos it will confuse things). i aimed to wake up with pretty much the same BG as before i went to sleep, now i fully trust i wont hypo during sleep, which is bloody reassuring. so if you wake with higher BG before sleep then you need more, lower you need less, the same then 8) but it might be best to speak to professional before adjusting basal if you don't understand it fully, though personally when i did they were wrong anyway and just told me to up it!
(basal is to counter your liver pumpin' out glucose so it doesn't matter if you go to sleep with 10mmol/l and wake with 10 cos it's doing its job)
once your basal is good and your waking with a similar BG to what you went to sleep with you can start learning/guesstimating how much you bolus (mealtime) insulin you need. so for every carb we eat we need to inject a certain amount of insulin so that when it's breaks down to glucose and moves into the blood it can taken up by our cells (lowering your BG or keeping it stable).
before i understood much about BG control i just kept on testing which led me to being pretty clued up. aim to get you bg's between 4-8 for now (defo under 10). you might feel a bit low at 4-5 i used to untill i got use to it. when you get a bit more of a pro you can mimic non diabetic BG's but that'll come after a bit of time.
3 times as much bolus with dinner seems a bit weird to me? but if your eating 3 times as many carbs with dinner then hey it makes sense.
combine your efforts with this forum and eventually you'll be a pro. there's a lot of veterans on here that'll always offer support and help. (look after our BG's and few years time they'll be us) if that makes sense.
all best,
howie