Hi andy18 and welcome
You'll find this forum to be a great resource for experience and advice. Read around and ask questions - there are forums and threads on just about everything. You'll find some helpful links in my signature block below, as well.
The standard advice (which has worked well for me) is that your blood glucose level two hours after eating should a) not be more than 2mmol/l higher than your blood glucose level directly before eating; and b) the second reading should not be above 7.9.
This indirectly measures the ability of our systems to deal with the carbohydrate in what's just been eaten. Everybody's BG rises after eating carbs; our BGs fluctuate all the time beacuse of food and many other things. The ability of our insulin response to clear glucose from the blood stream varies, so those of us with T2 tend to rise higher and stay higher longer than non-diabetics. Keeping blood glucose levels under control is important because high blood glucose levels over time can cause damage, particularly to the nerves and capilliaries.
The obvious answer (for me anyway) is that as carbs raise my blood glucose unacceptably, then don't eat them. I've managed quite well on around 20g carbs/day. That doesn't work for everyone, and that sort of very low limit might not even be necessary, so you will need to find what works for you.
best of luck.