Fundamentals:
-Trijumps obviously
-ROM infinite (setups, basic variations)
-Snapback setups
-Throw resets
-Tick throwing
-Grav/Tempest combos (especially during ROM reps)
-Corner throw resets (just time your hits or airdash forward into a throw)
…there’s more stuff but practice/figure those out in training ‘when’ you get a DC and stick…
As far as the teams you listed stick with ROW (Mag/Cable/Sent) unless your Sent isn’t up to par…obviously the other effective Mag teams ov note are MSP, MSCyke, and MSS.
I hereby point you to this site: http:www.zachd.com/mvc2/
Search for Magnetro’s Magneto tutorial vid (under the combos section) and that should cover what you need for now…
Its just a wavedash!
Basically wavedashing is just canceling your dash with a crouch
The motion for a wavedash is just 2P, d, 2P, d 2P…
The trick to it is to press 2P before your character is in a full crouch.