Hey!
May I start off saying good luck with the 60 Warlock. It is indeed a very fun spec and class to play at this level.
I have played 60 lock for a few years now so here are some tips to ensure you don't make the same mistakes I did.
Gems
Gems available at 60 are fairly limited so here's a quick run through.
You can get +6 Gems in
Vers, Int, Haste, Crit or
Stam. However, none of these gems I would consider to be bis unless you want to try and achieve a specific secondary stat build.
You can get + 3
Int and + 3
Haste/Vers/Crit - however again, these aren't bis either from what I have tested out.
There are some unique gems available - be warned, once these are used they cannot be re-purchased or removed from the gear you placed them in. These gems are the best available at 60 - you can only get one of each.
https://www.wowhead.com/item=32636/purified-amethyst
https://www.wowhead.com/item=32638/reckless-citrine
https://www.wowhead.com/item=32635/timeless-amethyst
The next bis gems are the 5
Int 5
Crit - These are sold by the old pvp vendors, 1 mark of honor for 1 gem - alternatively they can be sold on the AH so sometimes it's worthwhile just buying them if you have run out of marks.
Gear
Luckily a lot of gem gear has innate versatility already so you don't need to stack it via gems too much.
I'd say BIS gear is as follows for a Verse Heavy build:
https://www.wowhead.com/item=41112/mechanized-snow-goggles - Of the Aurora 11 Haste 20 Vers
https://www.wowhead.com/item=88273/armsmasters-sealed-locket - 32 Vers
https://www.wowhead.com/item=25925/terrorcloth-mantle - 10 - 11 Vers depending on upgrade
https://www.wowhead.com/item=39074/drape-of-distilled-hatred 11 - 12 Vers depending on upgrade
https://www.wowhead.com/item=24397/raiments-of-divine-authority&bonus=4097 or
https://www.wowhead.com/item=31657/chemise-of-rebirth&bonus=5590 - 9 - 11 vers
https://www.wowhead.com/item=12546/aristocratic-cuffs - 8 Vers
https://www.wowhead.com/item=24393/bloody-surgeons-mitts&bonus=4097 - 8 Vers
https://www.wowhead.com/item=35929/gholamcloth-wrap Or
https://www.wowhead.com/item=24395/mindfire-waistband&bonus=4097 If you can get the upgrade on the Gholam Cloth Wrap then GGs it's 100% BIS. Otherwise you can decide between the two 7 - 8 Vers
https://www.wowhead.com/item=24083/lifegiver-britches&bonus=4077 8 Vers
https://www.wowhead.com/item=44358/kilixs-silk-slippers&bonus=4113 or
https://www.wowhead.com/item=35581/rocket-boots-xtreme-lite 7 Vers
https://classic.wowhead.com/item=9447/electrocutioner-lagnut - 32 Vers
https://www.wowhead.com/item=11934/emperors-seal 22 Vers
Trinkets are always situational however fighting in the Borean Tundra for the past year as proven that
https://www.wowhead.com/item=11810/force-of-will is the bis trinket for survivability.
Weapons can be switched around - I luckily snagged an upgraded
https://www.wowhead.com/item=1405/foamspittle-staff this gives a whopping 34 vers.
Note that
https://www.wowhead.com/item=43664/manual-of-clouds is also a great cooldown item.
With this gear and enchants you should be sitting around 24% Vers 8% haste and over 590 spellpower. You are extremely tanky due to soul link and your drain life heals a hell of a lot more!
Professions I like to go are engineering and alchemy. The extra 23 Intellect all the time with no cost is better than the inscription shoulder enchant imo.
https://worldofwarcraft.com/en-gb/character/eu/stormscale/naoew