First about fairies. Are they important? I'm really overwhelmed by them even after reading a guide. I don't really understand what I should be feeding them. What the numbers on the skills mean. What skills I should be trying to get. If the ultimate goal is to keep trying to level one up as much as possible. Is there any advice I can get about them?

Second, I'm using a guide to help collect everything on the Adventure maps. On all the levels with two Skulltulas that I've seen so far, it says for the first one, kill 1000 enemies to get it to appear. Easy enough. But it still seems kind of random when it spawns. It didn't spawn for about a minute after I hit 1000 KO's... The second one says to finish the first mission, and the other requirements are to kill 150 enemies with special attacks, and take under 40 damage. I did that but it didn't spawn so I don't know what I did wrong. To clarify, do you have to finish the first mission first, then kill 150 enemies with special attacks and don't take 40 damage while doing it? Or is the 40 damage on the whole mission up to that point? Does the 150 enemies with special attacks start right after the first mission is over or once you've gotten the first Skulltula (and plus after the first mission started)? I killed at least 200 enemies with special attacks after the first mission started but it didn't spawn but I don't know if there was something else preventing me from getting it (I had taken less than 40 damage on the mission as well).

Thanks.