Solar Nebula hypothesis describes that the solar system - the sun and all planets were formed from the solar nebula about 4.5 billion years ago. Thus, it is not a model of solar system.
Heliocentric model and geocentric model describe how Earth, sun and other planets revolve.
Heliocentric model suggests that Sun is at the center and all the planets along with earth revolve about it where as geocentric model suggests the Earth at the center of the solar system with sun and other planets revolving about it.
