[Game math questions]

  i know im asking alot of questions today but just want to get
  it out of my system now…

  is there a "formula" for for figuring out (a) slow leveling 
  system, (b) weapons/armor/item buy / sell price (c) creature
  hitpoints vs experence vs drops (d) spell mp vs timelimit...
  thats all i can think of now...

[Tile questions]

    this might be a stupid question, but what % of a tileset
    can be changed before you can call it your own… ex.
    i like the zelda tiles because they are very clean, so lets'
    say that i took a "zelda tree" and i recolored and shaped
    it slightly and added some new slight design features,
    would i you be able call it my own, even thought it still
    sorta repersents a zelda tree in some form or other.

[Website question?]

i dont know but how do i get a ".TK" on the end
of my game site name. (eg. www.gamename.tk) i
only ask because it seems all the mainstream MMOG
games have this mark "tk" instend of a .com or is
just an oversease thing. anywho, any info would
be helpfull.