So for PVE you wand high resilience which is DR, Recovery used to be important because its how fast you start to regen health after you take dmg. But these days most classes have some sort of healing so its not that important for PVE but one of the main stats you want to have high for PVP. Dicscipline is your grenade cool down, int is your super cool down, mobility is basically a hunter stat since its their dodge cool down which in turn procs a lot of their abilities. For other classes mobility is your strafe speed. Which is sort of important in PvP. But not as important as nades and recovery.
So for PVE go for something like this...
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As for aspects and other shit inside of your class, I would look up some popular builds on Youtube. Unusually they are tied to some exotic armor piece so you have to make sure you farm those out inside of legend lost sectors. But dont worry about that until you reach 1800 or 1810 power.
As for leveling they have missions for some exotic pieces now. So make sure you do those. Just visit all the NPC at the tower and some will give you exotic missions like this...
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And just keep grinding until you reach the soft cap of 1800 power. Then it will take pinnacle rewards to get from 1800 to 1810 which is the pinnacle cap. It really does not matter what you wear while youre leveling up, just make sure your resilience is high since its straight up damage resistance. Thats the one stat I would have as high as you can get it.
And then when you do reach 1800 or 1810 is the time to start hunting for high stat armor. Which you can just focus from the seasonal vendor. go to the helm and then visit riven, as you do the seasonal activity you will get seasonal engrams which you can focus into higher stat armor pieces to start building up your stats. You can equip your ghost mod with a discipline armorer which sort of forces the stats to lean on the top 3 rows of your armor which are the most important. You want nice spikey stats on your armor which are 64+ like the below....
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the first is masterworked which gives it that +12, basically +2 to every stat, and then a discipline mod added to give it +10 discipline. The second hunter leg armor is jsut a raw non masterworked piece how you will get it from the vendor.
Go to the DIM (destiny item manager) website and log in. This will allow you to drag and drop weapons and gear from the vault to your characters and back and forth from character to character. Also go to D2 Armor Picker, which will scan all of your gear and allow you to make builds with the stats you want so you dont have to do the maths...Like below...
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This will allow you to select the stats you want to make 100 or 80 or whatever, then on the right it will show you what gear it will take to get there what modes to equip on the gear and also how much in mats this will cost to masterwork them.
Dungeons are an end game activity so until you have a proper build and are at least 1800 I would stay away. Perfect way to get to 1800 is jsut to do the strike playlist and do the bounties wherever you can do them from the strike playlist, PvP, gambit, seasonal, gunsmith, etc... They are a nice way to level up your seasonal pass which also gives you some nice high stat set of armor.