Can something come from nothing without an idea first?

Ok, so those who dont believe in a God....... so everything on earth has a creator right, with an idea to create it? like the tv, or crackers or a bike right? so without an idea how could the world be created without something creating it who always was, something like God who sits outside of time? How was the first cell created? with gases mixxing together? so how was the gases created? so without something that always was............... it boggles my mind how science seems to think that we just boom boom bang here. what is the purpose of life? how is there a purpose without a creator purposly creating us for a purpose?? Please be respectful when answering!