1. How do i know which craft weapons are any good, and does it even matter ? I meah the machine guns you put on small helicopters, LMG, MG, BOMG, etc. Do their stats matter at all ? Or just slap any random 4 MGs on that heli and dont bother thinking too hard about it ?
I personally think early aircrafts are completly useless, tho you right in that matter, it's really dosen't matter whatever you gonna put on them, if you wanna be really sure just check their stats idk.
Speaking of minitanks and armoured cars...what can i even do against them ? Light cannons give 0 damage. Grenade launchers and Milkors give 0 damage. Miniguns - 0 damage. EMPs ? Minitanks take 40% damage from EMP, meaning it would take at least 3 EMP grenades per minitank, and that doesnt help with armoured cars at all. High explosives (that i have a very limited amount now with no way to get more of) ? My only Gauss pistol with a single clip that doesnt even have a reduce armour stat ?
Granted, i killed some vampire knights the other day with some sniper fire, but they are melee and there were civilian distractions as well, it took quite a while.
Just keep shoting you gonna get there eventually. If you not sure, use explosives and dynamite, in case of minitanks if i remember EMP grenades are cheap and good way. The psycho weapon is the way as well, check other type of damages other then ur favorite powder-sticks

4. Speaking or armour, early on you get Bio-Exo suit...what is it for, exactly ?
I have a theory, but that would be a slight spoiler. Let's say... there's could be an agressive enviroment where you need some protection. Better then nothing.
6. Speaking of knockout, i got some dart muskets here, am i correct that bio damage has to get through armour first to do anything, but electric damage ignores armour completely ? So to capture armoured targets bio darts are useless ? And what is the point of poison darts, exactly ?
See, every armor has a resistance to something. Most often it's either to kinetics or something else, a huge number of enemies have no defense against gas or psi damage for example. Again, see the characteristics of enemies and your own armor. Weapons usually say what type of damage they do, it's even color-coded.
8. Are dogs the only real way to spot stealth units ? Is there anything else i can do ? Like, peppering the terrain with fire or proximity mines...err...
I mean you can just see them, you just need to get a bit closer. Agents have a highly functional detecting sensor called a... eye. :p You can also use motion detector, if you have problem with like finding them.
9. Will there later be a better\faster way to increase the usefulness of AI drones ? Because in my opinion you dont have enough time really to raise it's accuracy the hard way before the invasion starts. Outrunner armor is a complete liability in harder, more enemy-rich missions, so you can only take it on very occasional easy walks, and i'm finding myself almost at invasion with AI barely over 60 accuracy.
You gonna have transformation for AI later in a game, just like for your other agents, however i personally find usage of AI until pretty much late game and outside of tanks completly useless.