Have a look at some of the posts from newly diagnosed as there are suggestions there for what foods to avoid or go easy on.
There are a number of different approaches people choose to take, low carbohydrate being no more than 130g per day total carbs, low calorie, or shakes-based regimes but people need to choose a way which is enjoyable otherwise it will not be sustainable. What way is suitable may also depend on how high your HbA1C is so where you are in the diabetes zone and if you have been prescribed any medication.
If you would like to post that information that would help people make appropriate suggestions.
Remember it is all carbohydrates which convert to glucose so reducing those in your diet is important. Potatoes, rice, pasta, bread, breakfast cereals, pasty, tropical fruits as well as cakes, biscuits, sugary drinks including fruit juice are all big hitters.
Basing meals on meat, fish, eggs, cheese, dairy, nuts, veg, salads and fruit like berries will still give options for tasty filling meals.