Im Seeing this a lot in the thread, Blizzard does a terrible job of showing you how to progress your gear so I'll give people a hand.
Ignore any gear you get before level 70, this is a big thing , IGNORE BLIZZARD IN GAME GREEN AND RED ARROWS!!!
They suck and often make you sell/salvage upgrades. Now we have that out the way lets start with your first gear set, I recommend running bountys on normal in act 1 , this gets you rift frags and a chance at RoRG, now for the gear,
These are the stats you wanna look at for gear,
Rings,
Main stat (str/dex/int)
Crit chance
Crit damage
Your stat of choice
Amulet,
Main stat
Crit chance
Crit damage
Stat of your choice
Helm,
Main stat
Vit
Crit chance
Socket or all res
Bracers ,
Main stat
Vit
Crit chance
Ele dmg or all res/armour
Legs and chest and shoulder and Belt,
Main stat
Vit
All res/armour
2 sockets for legs
3 sockets for chest
Weapons,
Main stat
Socket (ALWAYS SOCKET YOUR WEAPON!(Emerald)
Following these items in just yellows you should be looking at around 400-600k damage and torment 1 will be face roll and it's a good base for you to move to the next level of gear.
Always remember that if you find gear with one stat missing you can use the mystic to add the other, running bountys on normal you should complete the set in a few hours.