feeling lost

if you try to eat the calorie amount mfp suggests, then you'll lose weight. Use the exercise log, too, because mfp will add in those calories used by exercise--they allow you to eat more and still lose weight. It's pretty easy. When you get used to it, you can change the categories to watch (maybe you want to be sure to get enough fiber or calcium instead of sugar or something else). There is an extensive list of foods in the database and if what you ate isn't in it, you can add it (if you don't know the nutritional content, you can Google it). I will say that I couldn't eat just 1200 calories (that's where they started me at) so I changed it to 1300 or 1350 and did much better.

feel free to add me to your friends.

Just put your current stats into mfp and it will give you the calories based upon that info.
Use a food scale to determine how many calories your really consuming. Eye balling portions isn't as accurate , especially for someone who is just starting out.
You don't have to follow any certain diet plan. Just eat the foods you love, but in proper portions . I lost all my weight eating ice cream and cookies daily. I ate one serving instead of 5, like I used to.
Just be as accurate as possible and you'll be fine. Weight loss comes down to calories in - calories out. Eat less then you burn .

When you set your predicted weight loss, set it for .5 pounds/week for every 25 pounds you need to lose. It'll help you develop more sustainable habits. A lot of people, even when they only need to drop a little weight, set the goal too aggressively and it can be hard to develop a lifestyle change and support your body nutritionally on low calories.

Here's a link to the MFP "Getting Started" most helpful posts!
http://community.myfitnesspal.com/en/discussion/10177907/most-helpful-posts-getting-started-must-reads#latest

Good luck--you can do this!