Did I eat too much today? (trying to improve my eating habits)

I have been working out just fine lately, but I feell like my eating still needs more work. Not sure though, that is why I thought I would ask.

For example, today I had 1 cup of coffee with cream and 1tbsp of cane sugar for breakfast. A half turkey sub that I bought at a concession stand thing (had two small slices of cheese), bottle of apple juice, chocolate muffin (the worst thing I had today, it had about 300 cals), and a small strawberry banana smoothie for lunch through the evening. And then aprox. 1 cup yellow rice with hot sauce, and powder green tea for dinner. I feel like I have to stop here and just eat fruits if i get hungry…

Should I eat less than this if I want to LOSE weight? Would it have been okay if I just skipped that chocolate muffin? Or does this seem okay?