I get hit die for resting. When somone levels up they get 1 dit die plus mod bonus yeah? Each time they level its just 1 hit dice?
1 hit die plus Con modifier per level. I allow my players to take the max of their hit die at level 1 (for example: if they have 1d8 hit dice and a Con mod of +2, they start with 10 HP) but require them to roll for each additional level.
Where as I allow my players to take the average progression, (the single number in brackets) instead of having to roll.
Which I believe is how you build an Adventurers League character. Or at least I know that is how it is in Pathfinder Society play. Which can be great as that forces everyone to the average health of the class, and in theory closer to the intended health by the designers. Rolling is awesome though because of the suspense, but there can be quite the let down of rolling low. I house rule that 1s get to reroll for health and healing just because I'm a nice guy who likes throwing big problems at my players, haha. The down side of rolling is also the extremes where you could have two people of the same class ending up with one having 2 or 3 times as much health as the other, haha.
Also, this has been an awesome thread full of even more awesome forum users helping someone out. We are rolling a nat 20 on this forum community!
This is currently the problem in my game. My paladin player has never rolled more than the average on his health roll when leveling. He sees himself as the "tank" of the group, but I have a barbarian with twice his hit points and usually send the monsters after him first haha.
(Edit: Apparently I can't quote people? I dunno haha)
The best way to go is just go to the armour table, it's pretty unambiguous. I don't think there is any time you would add proficiency (the only thing that could would be weird obscure powers which I can't recall of the top of my head).
So if the entry says 11+Dex mod, just do that, if it says 14+Dex mod (maximum +2) just do that. If it says 17, their AC is 17.
Some stuff adds on top of that, like enchantment bonuses, using a shield, abilities and so on.