Multiple Questions
 

1. You can die three times before you get spawned, but if you get revived, it doesn't count. Look under the time left and you'll see hearts. Hearts indicate how many lives you have left.

2. Right click your char on the top left hand of the screen and select Quit Party.

3. You have to shift + left click and you will get a box asking to allocate a specific amount. Type in what you want, then click onto an empty spot into your inventory. You can't shift + left click > select amount > sell to NPC shop. You must separate it first in your inventory.

4. Forgot the prices. Check for prices in Elderine, I guess. You get a choice between a mace or a hammer when you have finish your job change though, so no need to include the price of that. You'll have to check the skills as well.

5. You won't lose all the exp gained during the KQ, but if you're dead when the boss dies, then you don't get the bonus exp at the end or the gift box.

6. Yeah, if you have a good party. I've seen people farming, and what they do is have a tanker that goes and lure a bunch of monsters, have a cleric to heal, and have three other AoE-ers killing the mobs. You can also harvest, where you pick herbs and sell it to NPC to make a few silvers. Moonlight Tomb is a good place for that, but it's not safe to go there if you can't take the monsters down there.

7. Yes Elderine is a city. It has the NPCs that sell all the higher levelled stuff (level 20+), and will most likely be the town you hang around at later on until level 40+. It also has individual skill NPCs for each job.