Spellcasting (Psionics) requires no spell components (some material components can enhance spells however)
Casting stat can be INT, CHA, or CON depending on type of Psion.
Psionics are known spell casters (usually sorcerer), and use the DMG Spell Points Variant.
Psions are grouped by RP style, Egoist, Nomad, etc that influences spell selection.
Psionic Feats: Telepathic and Telekinetic very common.
Use Magic Initiate feat as Template for Wilders.