You don't need endgame crafting to make gil just find that one item that currently sells well and if the market gets overflooded move on :P

For rotations you basically will more or less need all classes on 50 for the crossclass. I consider myself a casual crafter even though I have a 3 star and do my weekly caps for like 4-5 weeks now.

Basic Crossclasses you should get either way:
Careful Synthesis 2
Bryegots blessing
Comfort Zone
Tricks of the Trade
Steady Hand 2
Hasty Touch
(might've forgotten another obligarory)

Rest depends on rotation you feel comfortable on.

On 50 I started:
Comfort Zone - (Tricks of the Trade) - Inner Quiet
Did my progress with 1-2 Piece by Piece and mostly Careful Synthesis 2 under Ingenuity 2
And Quality with Steady Hand 2 - Hasty Touch -> end it with Bryegots Blessing
Used Tricks whenever a Good

With the 50+ additional skills I go:
Muscle Memory - (TotT) - Comfort Zone - (TotT) - Inner Quiet - (TotT)
Progress with Steady Hand 2 rapid Synthesis and finish off with Careful Synth 2 (dem maths)
Quality with Steady Hand 2 and Hasty Touch / on red(good) use Precise Touch and TotT only if u hit the end of Durability or need the CP for another Masters Mend
Depending on Good or not Ed Quaility with Bryegots Blessing/Brow

Maybe that helped, but as said I only craft casually for own needs.