Some of the logical things that would likely happen, if our Sun suddenly disappeared from our solar system,.you would get a fairly accurate idea of the chain of events that would take place .
Though estimated billions of years from now for that to happen, however much before that our earth would have been engulfed by the sun’s increasing diameter when all of the hydrogen would get converted to helium, even prior to that all our oceans would have evaporated by the sun’s rising temperature…..…. :)