They have been one of the most interesting group in the entire DC Universe but I don't know too much about them. I was wondering a good place/order to read about the Fourth World for Story Arcs and Mythos?
Also any current ongoing series?

@pommy223: Darkseid is in the current Wonder Woman arc. Orion & Lightray were recently in Hal Jordan and The Green Lantern Corps. Mr. Miracle has a current miniseries written by Tom King.

If you want to go with some classic stories I'd suggest collecting the Fourth World Omnibus volumes.

I recently read the Mr. Miracle by Jack Kirby trade on Hoopladigital.com. If you have a library card, I'd say check it out, or buy it for $5 on Comixology while it's on sale (actually, it would be a good time to look into all the New Gods books since it has so many trades on sale for $5 until January 4th) or buy it from Amazon. I really enjoyed it.

https://www.hoopladigital.com/search?page=1&q=jack+kirby&scope=Everything

https://www.amazon.com/s/ref=nb_sb_ss_c_1_16?url=search-alias%3Daps&field-keywords=jack+kirby+mister+miracle&sprefix=jack+kirby+miste%2Caps%2C170&crid=2GQLVS4S7BWM9

That really just focuses on Mister Miracle and Barda though.