My advice to you young man as fallow:
You mentioned this will be your first time using Tren, Tren works different from person to person I recommend that you start doing 50 Tren/50 Test the first week "EOD" by the end of the week if you didn't get bad sides then the second week will be 75...
You need to listen to everyone advice on here, you are VERY young for AAS, my advice for you is train HARD, rest, and eat "good diet "
Personally I started AAS from the age of 32...
You will have a serious penis PROBLEM... and very bad sides...
I don't even know if Cabergoline would help with such TREMENDOUS Progesterone Receptor stimulation.
VERY BAD IDEA