I need some dieting advice?

I am 6 feet 230 pounds and would like to be 200 pounds or less. weeks ago I decided to loose weight by lowering my calories. I used to eat a box of ho ho's for desert every night which were 350 calories now I eat some cookies that are 150 calories and for dinner I eat some of the healthy choice TV dinners. Will this plan work ? any other advice you can give me