Class crossing question

[Niwashi]

Question is there a guide to see what classes are available to cross train this is my first char so yea everything's new.

BRD = PUG 42, LCN 34
PLD = CNJ 34, MRD 26
DRG = MRD 26, PUG 42
WAR = GLD 34, PUG 42
MNK = LCN 34, MRD 34
NIN = PUG 42, LCN 34
~
WHM = ACN 34, THM 26
BLM = ARC 34, ACN 34
SMN = THM 26, ARC 34
SCH = CNJ 34, THM 26

For specific skills, just check someplace like ffxiv.consolegameswiki.com and look for the job you're interested in.