to open fin gate, get iris up to one FP, give her the flowers you planted out front of her house or if you can tomato juice. Talk to mist in the mornings about 9A.M. She'll give an offhand comment about a seed she's growing. that night you'll have a dream. any time after that stop by Iris's house around 6 or 7 P.M. Gelwein should come waltzing out as you try to enter.
The earliest place for you is the sky fish ( i think ) in the place right after the fin, then after the tail tree, in the drain area, when you go down the first flight of stairs you can get some from the sealy, I think the tortas' drop it, but not sure. Level 10 ones can be gotten from mini dragons or the micro dragon, at the snow ruins sixth floor (and some on the 4th I believe), or the tower of glory (i think) garden.
Current mass playing game : Rune Factory Frontier, this stuff is addictive !! Of course, Diablo 2 Forever! :P