You can save yourself a lot of $$$ and order directly from Medifast.
You can then join the online Medifast support group where you can get a "free" health coach.
You will be wasting your money at the center, it does not offer you anything you cannot do on your own.
I'm almost 15 pounds down in a month and two days - I'm right around your stats but I'm 37.
Medifast works wonders, it's extremely strict but I prefer that and need it.
The only thing that really sucks is the "Medifarts"!!!! Not sure if it's the sorbitol, soy, protein, or milk in their products but I fart around the clock and nothing helps - so that's a downside but I'm happy they have no smell.
Also, you will want to drink as much water as you possibly can handle or you will get hungry and/or dehydrated. You should take a Biotin vitamin to prevent hair loss which can happen with low carb/low calorie diets where people lose weight rapidly.
Please don't go throw your money away on one of those centers - you don't need it - everything is available online.
YOU CAN DO THIS!!!