A1: You can use healing stuff on NPCs. Just put the stimpaks or fruits or other healing chems into one of your character's quick weapon slots and aim them at the NPCs just like you shoot at someone.
A cheaper way for healing NPCs is having your character use his "first aid" or "doctor" skills on them.
You can also tell him to use his healing skill on himself, but this won't grant any XP and still reduces the "first aid" attempts you can use this day.
I only gave super stimpaks to my party members, normal stimpaks are too expensive and heal too little for the action points they need to spend in combat for using them.
A2: Not sure what you're asking. But it's quite hard to mess up FO2. Consider reloading when you accidentally made a whole town attacking you, but you can kill and loot whole cities and still finish the game. In my playthrough I messed up two locations and had to kill everyone there.
A3: Items lying on the ground or dead bodies will vanish. Put your items onto shelves or other containers.
A4: Action points can be increased a little with perks or drugs (bad).
For armor the damage reduction is more important than the bonus to armor class.
Which weapon is the best for you depends on your playing style. Look at range, speed, weight, strength requirements and damage dealt and don't forget to look at the modifiers the available ammo has.
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