Experience is the best teacher. Just keep playing a lot of Toss, you'll devolope your own style and technique. There is no one way to play Toss, thats what makes SC so awesome.
I personally love to play games with my enemies. Once I totally went en-mass Obs over to one side of his base. They are cheep so I kept building them and sending them over to a corner of his base. When he was focussed on that part I attacked his open spot and slaughtered him. It was pretty good and smooth for rushing with obs. lol
PS> with your replay, yeah, use dectectors. you just have to, at LEAST 2.