Hello!
I'm not too sure what food mixes you could get in Ireland but in England you can get lots of different types. I personally get the Natures Touch food which is suitable for dwarf hamsters. Realistically when looking for food it's best to go for the food that looks quite dull in colour as it's more natural and doesn't have any artificial colours in it etc.
As for giving veg, it's best not to give too much as it can give them a bad stomach but they do also need it in their diet. Maybe give them a very small portion once a day or once every couple days. The best for dwarfs hamsters are usually dark green leafy veg. Carrots aren't too good because they are full of sugar and dwarf hamsters are quite prone to diabetes.
I hope this helps and best of luck!
