I just purchased the DLC for DarkSouls3 and It is my first time purchasing DLC content. I have spent some time trying to find information for this title but to no avail. I am not sure how to access the DLC for this game on the PS4 and would appreciate the advise of someone out there who is familiar with this. thank you.
Downloadable content for Dark Souls 3 has not been released in any territory at this time (08/31/16).
The first DLC, Ashes of Ariandel will be released on October 25th, 2016. To get this DLC, you can either order the Season Pass (which it sounds like you already did), which will grant access to all future DLC, or you can buy the DLC by itself. The season pass can be purchased on the Playstation store right now, but the listings for individual DLCs will be only be available on the store when they are released.
To clarify, if you buy/bought the season pass, you will not have access to the DLC immediately after purchase -- you must wait for the release date. When the release date arrives, go to the Playstation Store page for the DLC, and select the "Download" option.