well, steppers are what their name suggests, steppers
they rotate via steps.
to get it to keep spinning you must turn on one step after another.
you must find gnd, connect it to battery - and find out which wire goes to which coil this is easy.
then you must turn them on in the right order. ie 1 then 2 then 3 then 4 etc... this will make it keep stepping thus rotating.