Dark Matter and Its Gravitational Field

dark matter is this peculiar class of particles that neither emits, absorbs or flects light. The only thing it does is deflect light, because it actually has mass and it's matter, and therefore has a gravitational field. Once these cocoons of dark matter get massive enough and they have decoupled from the expansion of the universe, held by their own gravity, they start sucking in gas, hydrogen. And galaxies gite, and the first stars form. It ignites because some conglomerations of ordinary matter are so dense that nuclear fususion ons. Am i correct? So about 350 to 370 million years after the big bank into the 13 point eight billion year historio universe