Injects are the safer practice. They are less toxic on your body and overall, are going to produce better, keepable gains, considering you can use them longer and good doses. I would start with a test cycle. Tese is, afterall, the base of all steroids. All others are derived from test, and will accomplish small variations for specific goals, when added to test, but test is a drug that should be used as the base of your cycles and can be manipulated with AI, to get the effect you are looking for. In your case, for mass, you don't need as much AI. You can also use something like dbol as a kick start, to get the cycle going and produce some mass gains quickly, getting your body and mind into the "get big" zone, within a couple weeks. Here is how I would use these compounds for a first timer

1-12

350-500mg test E or Cyp EW, split into 2 shots

arimidex .5mg EOD or more as needed for estrogen control

1-6

Dbol 25mg ED split into 3 oral doses

2 wks after last shot, start PCT, 100mg clomid for 7 days. then 14 days at 50mg