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The cubed powers are Ambos pride (or possibly the furnace if you use ethereal), Lamentation, and Ring of Royal Grandeur. (it removed them when I edited it to update it for new season and will not let me add them again for some reason)

you only want 2 pieces of the captain crimson set and 1 of those is the belt but you can choose if you want the boots or the pants as the other. Whichever 1 you choose to do make sure you have the WW set in the other slot so you get the 6 piece bonus of the wastes as well as the 3 piece bonus of captain crimson while you use the cubed ring. You want crit chance, crit damage, cooldown reduction, preferred damage (lightning or physical), and a socket on the flavor of time and you want them as close to max as possible. This is only possible with that amulet but you will need to change move speed to get it and it's difficult to find 1 with all the stats you want. This is the easiest WW build to gear for because you do not need to deal with trying to get perfect rolls on the belt and the crimson set is crafted (meaning it's easy to get perfect ones by spamming bounties). There is a speed version of the build that changes a few items/skills for t16 speed farm as well and you can see it here https://www.d3planner.com/503500235. You can use physical instead of lightning just replace all lightning damage listed in stats above with physical. With the Doombringer or Odyn Son, you will go with whichever 1 has the correct damage% for your build (Odyn Son mace has lightning while Doombringer has physical) and Ambo's Pride in the other hand but try to make sure the weapons have high stat numbers (especially the damage%). If you do decide to wield the Ambo's Pride like that you replace it's power in the cube with The Furnace and as mentioned it will give you more damage vs the set swords but it will also give slightly less defense. The best potion is the tower but you can use whichever one you want. If you can not get a good Doombringer/Odyn Son you can use a Sun Keeper but keep in mind if you use that or if you cube Furnace you will not do as much DPS against the trash (so it's best to only do that if you have a trash killer in the group).

Use the weapons suggested above till you get an ethereal (preferably a 2 hander but you can use a 1 hander with 1 of the suggested weapons above so long as it is not part of a set) and you want the legendary power on that to be the one from Ambo's Pride or the one from The Furnace. Once you have that you want to change the legendary power in the cubed weapon slot to the 1 you did not get (so if your ethereal has the legendary power from Ambo's Pride you want to have The Furnace in the cube).

The Flavor of Time should have your preferred damage type (lightning or physical) on it as well (that often gives you more DPS than the others posted above and therefore it's probably the most important).

Paragon Priorities

You do not need max resource at all. You also might wanna avoid area damage altogether (in paragon and on gear) because some people seem to lag when you use area damage in multi player games but I play solo mostly and therefore area damage is a must.