Guys please give some advice

Masteries are a lil bit of a personal preference. Things you need to consider are, are you willing to spend / grind to unlock some more fun options (Assassin / Suicides / Willpower to name a few). The fights, ie some remove the dex mastery when fighting mojo in flow as aw boss.

Consider something like this:

It's not too expensive to build but should help you on most content that you want to do from here. You still will be left with plenty of points to allocate. Again, just to re-iterate, its a personal choice...

Mystic champions benefit from Mystic Dispersion but people run MD with different levels 3/4/5.

Personally DW is hecka lot of fun with NF, Assassin helps a lot for finishing oppenents off quickly.