Hi Ronnie
It's great you are trying to do this yourself well done!
At 150g you are doing just over half the normal daily allowance which is a great place to start and where many of us would recommend you start from. The knack is to reduce the carbs that do the most to raise levels so obviously sugar (sugar in tea and coffee, biscuits, cakes, all pretty obvious). Not quite so obvious is the sugar in fruit juice and just fruit in general. Next the five big ones to attack are rice, pasta, breads, cereal and potatoes. Cutting those down by a decent amount will give you probably the most benefit as most people eat more of those than sugary things yet they do roughly the same damage to blood levels. If you cut them down then make sure you replace them with extra meat, cheese, eggs, fish and especially veg. By replacing those starchy carbs with veg you are simply replacing some carbs with better lower carb ones. On any of the starchy ones you can't give up straight way swap from white rice to brown basmati rice, white pasta to brown or tri coloured pasta and white bread to wholemeal or even better a brand called Burgen soya bread.
What you are ultimately looking to do is get 2 hour post meal readings less than 8 on your meter then you will be in safe levels for the vast majority of the time. If you have been running "high" for a while you may find that very difficult for a while so in the meantime try and get the 2 hour reading not to be more than 2 bigger than where it was before you ate.
Can't really tell you a grams per day figure to aim at as it varies person to person. For me I had to go right down to 60g / day but others do ok near where you are. That's why the meter is so important as it will guide you to what's right for you.
I try and do a very low carb breakfast so something like an omlette or even occasionally bacon and egg or yoghurt and a few "berries" and also a low carb lunch then save most of my "quota" for my main meal at night. I find that helps a lot because the insulin you produce works better in the afternoons and evenings. Never understood why but it just does.
Do you take any meds for T2? On a low carb diet Metformin is usually fine with no side effects and is also beneficial for your heart. Why not ask the doc about it. Its not a magic pill and will oly reduce your levels by 1 or 2 but really does help stop spikes like your 14 you got.
Keep asking questions.