If you take a look at the stickied thread at the top of this forum it gives you absolutely all of the information you need about becoming fedex certified. The thread can be found
Here.
You also have the option of using sites like ShipYourReptiles or ReptilesExpress which do not require you to personally become certified and can sometimes help out with discounted prices.
Reading the stickies at the top of all of the forums here is always recommended as 90% of the time it will have answers to all of your questions. Hope this helps.