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Hi! ...What we must remember is that the electrons are already in the circuit and all we do when we connect the battery is make the electrons that are already there move in a specific direction, depending on the polarity of the battery.
It might be advisable to note that the movement of electrons is such that they move from atom to atom which is an extremely small distance as one electron is displaced from it's adjacent atom another is displaced on some other atom.Imagine if you can billiard balls in a row, hit the first ball with a cue and the ball at the far end moves, this might give you some idea what is happening as each ball only moves a small distance during this procedure. this is really a simplified demonstration, and really to work in the field of electronics it does help to understand what is happening but is not not required knowledge for experimenting with electronics circuits. Hope this helps a little Cheers Macgregor.