1. buy cheap pans as you'll probably destroy your first set by burning stuff onto them (and if you don't someone else will)
2. keep stuff in your room if you can
3. buy some easy recipe books so you can eat things which are a bit more interesting as it will motivate you to cook if you actually enjoy the food!
4. slow cookers are amazing
5. keep an eye on your use by dates so that you don't end up throwing things out/wasting food
6. buy the minimum possible so you are forced to keep on top of your washing up
7. make sure you know a few basic things before you go, e.g. make a tomato sauce, cook pasta, eggs a few different ways etc
8. online shopping is a good way to make sure you are staying on budget for food
9. splash out and buy yourself some stuff to flavour food with when you move in (i.e. herbs, spices, olive oil, and others depending on taste e.g. soy sauce, wine vinegar etc), again if you like the meals you make you're less likely to get take out and this stuff lasts ages
10. baking will make you friends - learn how to make cookies/brownies/muffins and bake some and share them with your flatmates
EDIT: also - never shop when you are hungry, you'll end up buying crap you don't need