I will suggest getting the 2nd Barrack as early as possible..
unitll then the best thing to do:
prepare your extra silvers as awakening fodders...ie: 30CC1 as many 'extra silvers' as you can...
once you get the 2nd barrack..
store all your aw fodders for later use...
I will also suggest not to roll untill you get ur barrack..
If cases are worst then feed extra silvers to premium units...
or units that can cause skill ups like.
[ Lauren to Spica...]
Try to save as many silvers as possible and not waste them too much...
best of luck