Zona, aaah.. Program mode..
i made an assumption (big mistake) that our shooter was using manual exposure and manual flash power setings.
(the way i do it, i never use TTL... my triggers dont allow me and i just dont like it
)
KKT, have a look at
www.strobist.com
this site will certainly get you going in the right direction.
as for the black half of the image, you're probably exceeding your max sync speed.
it should be around 1/160th or 1/200th for an entry level camera.
but i dont know Sony at all.