There's not set number of Carbs Dawny, you just have to find what works for you. The best way to find out what you can tolerate is by testing your BG before and then 2 hours after eating to see what effect those particular carbs have had on you.
For example many diabetics can't tolerate jacket potatoes, but I found they had a minimal effect on my BG, whilst porridge is a god send for some but a complete nightmare for me!
Have you been provided with a BG monitor? If not, many people on here use the CodeFree from amazon or homehealth, it seems to the the cheapest in regards to testing strips etc.
An average day for me, carbs wise is none for breakfast (I'm more insulin resistant to carbs in the morning so I don't bother) maybe 30g of carbs for lunch, and then around 50g for dinner and the odd apple or berries for snacks during the day.
This is a fairly low carb intake, but I have found over a log period of trial and error what works for me. So I'm afraid there's not set answer to your question, but changing your diet for 'better carbs' that is, lower GI type foods can only be good 🙂