1) get the "blue rock fragment" from 6-4 to 6-7 then go to hamel blacksmith to "alchemize" it
2) It actually has 2 kinds but for the "fire version" of that weapon it's on 6-7 and "ice version" is on 6-6
3) Only tips from the inside are being spread; no exact information is released as of now but basing it on the current update speed of HK server about 3~5 months time from the release date of the content on KR
4) 60 space cubes and doesn't include bonus cubes from defeating the special area per section
5) Max level is 60, you just got confused on what he asked. It doesn't concern whether or not your way past the expected job change level since it wont affect the option that you still change your job to a Sheath Knight.