Actually, I'd like to change what the previous poster said.
Things to avoid
1) Over eating
Yup. The other stuff is good (exercise but you definately don't need to go to any gym for that) but for weight loss, what you eat is much more important. Weight loss comes down to calories in vs calories out. At your weight, your should be (about) eating 2041 a day to maintain. So if you want to lose a pound, aim for around 1500. Do this slow and steady.
First advice? Record everything you eat for one week. Be dead honest. This way you can look and see what can be avoided or what choices can be a better choice. Check out fitday.com for help on calorie counts. We have a nice diary section that you can use to record.