I, too, am very sorry for your loss. Things can be such a whirlwind in the next few days, just allow yourself to be carried through it being busy and otherwise occupied as this actually helps.
Depending on where he passed, that location may be able to help you firstly. Next, a funeral director. If you don't know of one, see if there is one anyone you know would recommend. The directors can be so very helpful with what things to do at this time. They organized a death cert for me for someone this past year, the services etc. as it was all very difficult to think about.
If you know what your dad's wishes were with regards to type of funeral/burial/location etc. thats good, but if you don't, do you have any family that would? Or family that would know of where his legal documents would have been lodged at? (presuming he had a will and other documents indicating preferences etc.)
This is tough, one thing at a time... Please PM me if you need anything further. Sending you peaceful thoughts, you will get through this.