It's good that you came here BEFORE starting a cycle. Would definitely not run Deco for a first cycle, but without being properly educated from places like this, it's easy to see why you'd want Deca on a first cycle. I had a friend run Deca for his first (and only) cycle and it completely turned him off steroids forever because it ruined his dick. He had no clue what he was doing.

This is a good place to learn. Read the stickies, read the threads that you feel apply to your situation, learn from others' experiences here, and you'll start your first cycle from a better place than probably 99% of people when they first start.

Welcome to the forum