Beginning again

I did this once my sophomore year of college, I have been sick of being big my whole life and I'm ready to really dedicate to this now.  When I did it before my best friend showed me and taught me the ways of Ana, and I lost 20lbs in a month.  This raised questions and I hid it very well, but then my best friend decided to stop and she threatened to rat me out if i didn't stop too.  So i managed to workout and eat in a way that i haven't really gained or lost weight over the last two years.  However now I'm sick of being too big, and she isn't here to stop me.  I started today with doing a 50 minute elliptical workout and an ab workout, and all i have ingested is two pots of coffee.  I want to do this right and lose a bunch of weight and just feel thin and sexy and athletic.  I hope people will offer me tips as I know i need a lot more control than i had before.  Hoping that things will go great this time around.