1. You lose 1% of your exp if you die, pretty laughable
You lose nothing if your exp is less than 100.
2. There are aggro monster, speedy slime is an example. There are also monster that attack in group, they aren't aggro, but you attack one of them, the nearby monsters will gang bang you
3. Depends on the job you choose: if you choose potion making and stone making, sell the scroll making material. Usually I focus on stone making only, they are good at low level. One trick is have several friends, each responsible for one job, and you give all the materials to that one, so they level up job faster.
4. You can sell them for some copper
I can tell you that keep Apple and Herb Leaf for some higher level quest, they are damn easy to find at low level, yet damn hard at higher level <.<
Extra: Speedy slime is in Forest of the tides, near the gateway, on the right, among the imps and mushroom mobs. Can't miss them.
Kingdom quest can be taken from level 7, and I don't think you are level 7 yet
You can click on the glass hour icon at the bottom left of your mini map to check and participate in kingdom quest, or talk to the village chief.