Questions from a newbie =3

[Blaaaaaaaah]

Now that I got into closed beta I have some questions!

1. Do we lose exp when we die? Or only if we reach a current level? I died but I don't know if I lost any exp.

2. Are there any aggros? So far no monsters had come attacking me.

3. What kind of drops do you guys sell to make money? How do you usually tell if a drop could be valuable or not? I'm currently broke cos I can't even afford skills!

4. What are petals for? I've been pulling them out of the flowers, lol!

Thanks in advance =3

Extra question: Where are speedy slimes? ;~; Do I have to go through that blue door/gate thing? Or is that for the kingdom quests?