welcome bro...first off, you say you've only been working out for 3 months.....u need to work about about 2 years hardcore before you start thinkin about gear.....please post more of your stats, (age weight, etc) so we know what we're workin with.....
secondly, can your boys "get it up" just by taking deca....deca shuts you down hard and many guys get the feared "deca-dick" and have trouble with their sex life.....test is the ideal injectable IMO......
and last, there are great oral steroids for mass, however, this should be taken ALONG with an injectable to keep most of your gains....personally i think you should train for another year very hard, and just eat tons and tons of food (eat clean, high protein, lots of water) and you'll put on lots of mass naturally in a few months....i put on like 30 lbs over the span of a few months, newbie gains are great.....if you are absolutely positively going to take steroids, i would recommend a Test E cycle for 10 weeks.....a great starter cycle, and you could throw in some dbol the first few weeks if you'd like....its your body, so u can do what u wish, but just double check that you're ready to start pokin yourself (u can do it in the legs and not your ass).....again welcome to the board and feel free to ask us anymore questions.....we're here to help one another out....
wolf