First: You didn't tell us the concentration of the gear. Deca could be 150, 200, 250, 300 mg/ml. Big difference between the high and low end.
That being said, it's not a great cycle for a first time. Deca is a poor choice. Just use test. It will be very effective, and will minimize side effects. Deca is VERY suppressive, and is not for a first timer. AT ALL. Running even 1 cycle of deca is something many people regret for a very, very long time. It could literally cause you to lose the ability to have an erection for a year.
Run 2mL of test for 10 weeks, use adex at .25mg every other day. Then run your pct. you said you have your pct sorted (something I HIGHLY doubt), but if you don't want information in that regard, I won't give it to you.