1. When you enter a tile that's already been revealed and has a event on it do you draw another event?
No, you don't. Only the player who reveals the tile gets to draw the event/item/omen card.
2. when moving, if you stop to pick up items do can you then continue moving or have to end your turn.
You can continue moving. You only stop moving if you draw a card (any card) for any reason. So even if some game effect makes you draw a card without having revealed a new tile, you still stop your turn there.
3. the once per game tile for special increase is this once per game for each player or once per game for all players?
Once per game for each player.
4. if you kill a character can you pick up his loot straight away or do you need to wait a next turn?
You can get it right away.
Sorry for the stupid questions.
No need to apologize, we're here to help