Growing in a greenhouse

How easy is it to grow flowers, vegetables, and fruits in the same greenhouse? Will the fact that I will be growing different types of plants (flowers, veggies, fruits) and within the catagories growing a variety of things (Example: flowers-orchids, sunflowers; veggies-carrots, cabbage; fruits-kiwies, stawberries) make it difficult to have all of my plants survive? This will all be done in a greenhouse. Also, will I have less trouble when it comes to pests growing plants in a greenhouse or will the trouble be the same as if I were growing these plants out doors?