Woo hoo!! It's official!! You are an initiated sister. Congrats!!
I remember feeling overwhelmed with everything I learned at initiation. With time, you will remember things and be like, "ooooh, okay."
If you are wanting to know about making a signature for yourself with the letters, check out this thread.
http://greekchat.com/gcforums/showth...threadid=15458
TechAPhi gives a wonderful explanation on different letter signatures you can try.
Once again, welcome to our sisterhood.