I still play this game to this day. Some tips, gah I don't know if I have enough time to type it all, but I guess I could point you in searches.
Google AI guide, the way to understand how the AI works is important. Dragon Age Inquisition is different from how DA1 controlled. Though with Trespasser things are so much better thanks to offensive defense traits, like guard on hit, and the secondary trait options for skills. Give the AI some credit, I find that they handle themselves pretty well, until I notice they are doing something I wouldn't. Micromanaging is still probably needed, especially in tight spaces that confuse the AI due to layout boundaries (something to do with the way paths are designed. In tactical cam you sometimes can't even move the target cursor past certain obstacles, requiring you to find a route that you can walk without jumping to get to where you want a AI to go, or to select a target you want them to focus/place a AOE at).
Dragon Age Inquisition - Party, Tactics and Behaviors Guide!
If you are on PC there are some very useful mods to get too. Instant gathering mod is very time saving and valuable.
I was always a nightmare friendly fire player in the other DA games, but with this one I gave up on FF early because I couldn't even see which abilities counted as possible FF. I now play with FF but it's not as satisfying as the other games because it just makes me not pick the few abilities that have friendly fire. After this play I won't mess with it again, it's not challenging, it just limits me totally. The abilities aren't good enough that I feel it's worth a slot that another ability could use, or to slot it and hold off using it until the right time that I won't hit a friendly.
Warrior-----------
Two-Handed
Mighty Blow - Yes
Whirlwind - Yes
Vanguard
Charging Bull - Yes
Templar
Wrath of Heaven - Stun, no damage
Mage--------------------------------
Spirit
Mind Blast - No damage, minor stagger
Storm
Chain Lightning - Yes
Frost
Winter's Grasp - Yes with upgrade
Ice Mine - Yes
Wall of Ice - Yes, applies zero damage Chill effect when activated underneath ally/enemy. Lasts roughly 3 seconds on allies, 6 on enemies
Blizzard - Yes
Mana Surge - Yes, applies zero damage Frozen status to allies. Active Barrier blocks the effect
Inferno
Immolate - Yes
Fire Mine - Yes
Rift Mage
Pull of the Abyss - Yes
Firestorm - Yes, by the Dread Wolf yes...
Necromancer
Walking Bomb - Yes... Applies Weaken, spirit damage, and knockdown. Active Barrier blocks the Weaken and damage entirely.
Rogue------------------------------
Archery
Explosive Shot - Yes
Artificer
Spike Trap - Yes
Elemental Mines - Yes