I'm 17, 5'9 and 153 pounds. I want to try and build some muscle so I'm wondering if there are any dumbbell exercises I can do to help.

All I have is a dumbbell, but I'm looking for the fastest way to build size (strength can come later) with what I have available to me.

I usually just do 3 sets of 12 reps dumbbell rows with pretty good weight levels on each dumbbell. Is that sufficient to increase my lats? I dont have access to pull up bars. Should I do another 3 sets in the same work out?

I bought a 15kg Dumbbell set. How frequently will I need to use these in order to build up my biceps? In addition, what's the minimum amount of time I should spend for each "session" in order to notice any difference?
My objective is simply to achieve a noticeable increase in the size of my biceps.
Cheers

All I have is a dumbbell, but I'm looking for the fastest way to build size (strength can come later) with what I have available to me.