Let's talk about the passive skill tree
Basically you need physical damage, life and the Resolute Technique, Acrobatics and Phase Acrobatics keystones.
You see there are practically 2 types of melee builds - crit builds that invest a lot in terms of passives and gear into crit chance and crit multiplier and non-crit builds that pick up Resolute Technique. With Resolute Technique you never have to worry about hit chance and in this case 100% chance to hit is something extremely important, because you spend frenzy charges to flicker and you don't want to waste them by missing a strike, that way you can't get your frenzy charges back.
As a two-handed weapon build you don't have the awesome block that shields provide ( staves have a bit block chance but not nearly enough ) to compensate the lack of that defensive mechanic you want to pick up Acrobatics and Phase Acrobatics. The ability to dodge 40% of the attacks ( ranged and melee, physical and elemental ) as well as 30% chance to dodge spells is just amazing. Sure you loose armour but you don't have much anyway again due to the the lack of a shield ( high armour shield + X% shield defense passives = large amounts of armour ). On top of that you can dodge your own reflected attacks ( and reflect is already very easy to handle with the Awakening changes to it ... besides the map mod... don't run maps with physical reflect mod ). Based on your weapon type grab the nearby weapon specific passives.
Of course you should pick up lots and lots of life and enough damage nodes in order to kill fast enough ( killing with 1-2 hits is important otherwise you can't generate enough frenzy charges to keep flickering )
Pick up the two easy to access frenzy charge nodes.
Sustaining Flicker strike on mana is easy once you start using Blasphemy + Poacher's Mark, but if you have some problems before ( or after ) that moment i'd suggest to pick up Revelry and/or some mana leech from the Spirit Void and Vitality Void cluster or use a blood magic support gem until you can handle the mana cost.
In the passive skill trees below i haven't picked up resistance nodes. That is because everyone has different resistance needs based on their gear. Let me make this clear - you need to... you MUST cap your elemental resistances at all cost! If your gear is not enough to cap your elemental resistances then pick up resistance passives! Sentinel and Diamond skin are awesome resistance nodes and they have even more resistance passives behind them. Again - pick as many as needed to cap your elemental resistances at all cost!
You'll also notice that i haven't picked up many jewel sockets. That is because once again it depends on the jewels that you have at your disposal. When you consider grabbing a jewel socket do the math - calculate what you'll get from the jewel and how many passive skill points you have to spend to get that socket, then see if you can get better results if you just spend those points on regular passives. See which option gives you better results and go with it. There are extremely awesome rare jewels, don't be afraid to get sockets for them if it's worth it!