So, I definitely want to get into this series since im extremely interested in the concept and Hellboy but I don't know where to begin.  Is there a specific reading order and if so could you please tell me.  In addition to that are there any hard/softcovers that are on sale/exist in which I could purchase.  Thanks for reading and I hope you help me =D

Good call, Yes there are Many, many, Soft/Hard TPB's of BPRD. Yes there is a reading Order! BPRD first appears in Hellboy. Seek out some one shots, if you can, It's worth it great series.

Again, BPRD is a spinoff of Hellboy. I think "Drums of the Dead" w/Abe Sapien was the first non-Hellboy issue....

At the end of Conquer Worm Hellboy left the B.P.R.D. This is the point where the B.P.R.D. Series starts.
There is a TPB called Hollow Earth with collected One Shots.
The hole "storyline" reading order is Plague of Frogs, The Death, The Black Flame, The Universal Machine, Garden of Souls, Killing Ground, The Warning, The Black Goddess, War on Frogs, King of Fear.
 
There is although a B.P.R.D.: Plague of Frogs Hardcover Collection Vol. 1 
The 19xx stories are not connected to the big story and can be read seperatly