Freestyle - reach

I'm trying to get my arm reach more correct in freestyle ... so, I'm not sure where my arm should be (or where i should direct it?) as in enters the water through the reach and ending at the catching of the water with my hand. ...did that make sense? Anyway, i've found that sometimes I direct my reach a little away from my head, and other times I'll focus it to be directly in front of my head ... they both feel okay, but I should pick one or the other ... Also, i breath on my right side ... and i feel like I don't reach far enough/wait before the pull ... how long should a proper glide be?