welcome to the board. need to hear some stats.
do not run Deca as a first cycle. gotta learn the ABC's of steroids before running something like deca.
the deca dick is caused by increased prolactin problems and a stubborn ester that will linger for weeks after your finish.. this is why its crucial you run anti-prolactin, AI, and know how and what a PCT is. until you understand what those are and how to control the situation then steer clear of deca.