Firstly : we absolutely need a pet on the 20 lvl. I suggest to do not take a bear, he's too slow. If you dont want to exp you pet since 5th lvl you should take an Elder Wolf ( he's near Thul The Bull in Spearhead Peak - map in the further party of the text) or Elder Black Widow.
Ranger / Monk
Our attributes :
We need only 9 Marksmanship because we DONT USE any of the Marksmanship skills - but we still use a bow.
Our Beast Mastery should be 15 - not big difference, but we get twenty attribute points to spend..
Smiting Prayers - 9, optimal value.
Expertise - rest of points, should be 9, its a energy cost breakpoint.
Weapon :
- we should use two bows, a longbow and a shortbow, and change it when the foes comes closer. IMO best choice is collectors bows ( remember to dye it, its easy to mistake which bow is which ).
- we should also have +10 Energy staff, for the critical moments. Good choice is Morgriffs Staff, with 10/10 Recharge and Casting.
Skills :
Basically, skill set depends on that where we go. You can swap Feral Lunge ( if mobs havent flesh ) for a Beastial Pounce ( against spellcasters ) and other - just try it.
Base skill-set :
Feral Lunge
Ferocious Strike (Thul The Bull.JPG)
Brutal Strike
Balthazars Aura
Call of Haste
Call of Protection
Comfort Animal
Charm Animal
Druid Set with Superior Beast Mastery, Superior Vigor ( if you are rich enough

Tactic :
Before fight use Call of Protection ( CoP ) and Call of Haste ( CoH ). We send our pet to fight using longbow - when he runs to the enemy we should use Balth Aura on him, watch out to do not get too close*.
Pet most times attacks the same targets that we shoot from the bow ( and he stops attacking when we stop shooting ) - we have a way to control him.
Use three pet attacks when they are recharged but carefuly - it takes time until pet attacks with the skill and if we spam it, it wont stack. Just make some break between first and second skill-attack. Recast CoH after 30s and recast Balth Aura when its recharged.
Our pet does HUGE damage ( with skills about 60-70 per attack ) and we do some damage with our bow too ( 10-30 ) AND Balthazar Aura does about 20 dmg per second - this is deadly for most of mobs.
Our pet isnt targeted often, anyway keep CoP on him.
* - watch out to do not be targeted - this is the weak point of this build, our char hasnt got any self-healing and his life depends on the monks.
Good luck - I hope this text convicted you to try great and rare char who is the Beastmaster.
Anyway, sorry for my english, I'm pretty sure that I made many mistakes here - I hope its still readable

Any comments are welcome.