(okay, you have three skill points as a psychic. One of them must be spent on psychic skills, but you can spend more than that, up to the three you have.
A new technique costs the same amount of skill points as the level you need to be able to have it, for example a level 1 technique costs 1 skill point. To advance a skill, including psionics, it is 1+the level you want to get to, so advancing a skill from -1 to 0 is 1 skill point. 0 is not a placeholder rank either, a 0 in a skill represents a basic competence in it. )