This skill isn't normally part of a character's makeup. It represents amazing talents to manipulate the universe with the power of your mind.
Professional Psions wear black uniforms.
Depending on the campaign you are playing in, Psionics may be an important part of it or officially excluded.
There are no Psionic actions in the game other than those allowed by the Special Abilities. Note that some Special Abilities are considered Psionic because they stretch the bounds of believability. If playing in a more “realistic” campaign, the group may wish to limit or exclude some or all Psionic abilities.