Notes & Combos
It's pretty freeform with how to start your combos. You usually want to start with getting the spells online by pitching Marco, who happens to be tutorable with fiendsmith. The first main start should be getting Gammajin in rotation, because he enables a lot of plays, even starting himself to hop into any synchro you need.
If you're tight on summons and want a Nibiru counter, Draco Berserker will counter nib.
One of the best refuel lines if you're taking and baiting out hand traps is to go from Gammajin, summon Lurrie, and with an empty hand, going into Ragin. You can stack the triggers so you draw 2, then draw 1, discard 1. Practically refilling every play.
The main target to send to the yard with the field spell is Kushano, or if necessary Abanc.
Hard to have a real flow chart in Synchro cup. It's just very draw and matchup dependant on where you start, but you can almost always end on a strong board. The amount of non-hard once per turns really take it over the edge.