Yup, easiest is to start with a heal monk. You only need a few piece of Inna. Can craft the rest easily. You don't even need ancient or good stat. It's very forgiving. Whenever possible, get CDR and regen in all slot. Even if you can't, keeping the party alive is easy at GR60 or so. Most importantly, every party need a heal monk. You will be able to upgrade the rest of the gear easily.

www.diablofans.com/builds/58010-datmodz-140b-xp-hour-healer-monk

For higher GR, 65 and above, swap Leoric ring with h Zodiac.

Once you got bored with Healing, and have enough good gears, try Statix Monk.

www.diablofans.com/builds/63067-quin69-gr75-static-charge-solo-version

With the right party and gears, you also can do Sunwuki/EP monk with Furnace. This is also very good in speed GR farming.

www.diablofans.com/builds/58143-quin69s-ep-explosion

For fast mat/bounty farming, consider this perma-dash R6 build.

Http://us.battle.net/d3/en/forum/topic/18706672198