Hi msmandy12 ,
First thing you need to do is to take the GMAT test. You can register at http://www.gmac.org
. You require around 3-5 months preparation for the exam. Next thing would be selecting the target schools. Most people target 5-7 schools depending on their post-MBA career goal, Gmat score, location and cost.
In the meantime get yourself registered in forums like http://blog.Clearadmit.com
to remain updated with latest developments/ announcements by various Bschools. Read the book "How to get into the best Businesss schools" by Richard Mountauk. This gives a systematic step by step coverage of the entire Bschool application process.
hope this helps....