Your best to just stick with test for your first cycle - this way you can see how your body reacts.
I would extend the cycle to at least 12-14 weeks but that's just me.
Usually most people start to get their "ah ha" moments around weeks 7-8 for the first cycle ... "so it seems anyway."
I've seen nice increases earlier than that - but right around then is when the bigger transformation took place.
What ever you do - always keep test as your base.