1-4 dbol 30mg to 50mg ED
1-12 test e 500mg @week. (Mon and Thur injections @ 250mg)
A classic first cycle schedule.
It is all you are going to need if your diet and training are in check.
Save the deca for your second cycle. It is not going to be needed and would be overkill.
Good luck with your research.
Lastly, I would wait a few years before you do a cycle. 95% of 21yo men have not reached their natural plateau from training and eating alone.