Deca is in reality Nor-Testosterone... then there is testosterone... well you can do a deca only cycle if you dont want to have sex at all until about a month after you go off cycle... Deca only will make you loose all interest in sex and soft dick... if you take double the amount of deca in testosterone and take both at same time, you get to keep your sex drive.
A good and safe cycle for newbie would be 250 mg deca/400 to 500 mg testosterone En or cyp.
As for getting boobies, well you can do the full testosterone and take estrogen inhibitors which you can legally buy at places like
www.liquidresearch.com.
Get 2 bottles of each liquidex and liquid-nolva. Take the liquidex early in the cycle like after second injection, then start the liquid nolva at the last 1/3 of your cycle... continue the liquidex as long as you are doing injections, discontinue a week after last injection but keep the liquid nolva going for about 5 weeks after all injections stop. This restarts your testosterone production and protects you from any estrogen and other side effects.