Hello
@Fishey aka Brian and welcome to the forum!
There is a lot of advice on here -
Learning Zone, the red tab at the top of this page
Living with Diabetes on the Home Page of Diabetes UK
Look through previous Posts in the Newby, Food & Carbs, and if necessary Weight Loss Sections
You will almost certainly have to change your diet by reducing your carbohydrate intake, but as mentioned, many people take their diagnosis as the motivation to cut out junk food, processed food, a lot of booze, do more exercise, eat more veg, and all the rest of the healthy stuff we hear about
There is a lot to read and understand, which can be overwhelming, so pace yourself, and ask any specific questions -
don't be embarrassed, nothing is too silly or too simple