Welcome to the forum, you will find many great people on here all very friendly and helpful
You can get an app for your phone carbs and cals, i think its called. You have to buy it but its not expensive.
I use one called fatsecrets, which is free and the website
www.fatsecret.co.uk/
These sites give great info about carb portions.
After that its really going to be a bit of effort in determining what your carb to insulin ratio is. When I started the DAFNE course we all started on 1 unit of insulin to 10g of carbs. Then its just a case o testing to see how your BG levels are, maybe testing every 2 hours. If your BG goes higher than the starting point it could mean you need to increase your dose, maybe 1 unit of insulin to 8g of carbs or if your BG is dropping go the other way 1 unit to 12g of carbs. Do you have a Libre
I assume you will be on a bolus dose for meals then maybe a basal dose, once or twice a day as background insulin. It is also important to get the basal dose correct.Once the basal dose is correct, you are then simply matching your food intake to your bolus dose
Does any of that make sense so far