For someone that is just considering running their first cycle, your best bet is cyp or test e at 300 to 500mg EW for 12 wks, taken in injections split into 2x wk, Injections can make a cycle complicated quickly, when you have to inject gear that can be more on the painful side, or when you have to deal with ED or EOD injects. Along with an AI, test cyp or E would work great for a cutting or bulking program. Your AI will control estrogen and water retention, needing more on a cutting plan. Less on a bulk.
No matter what your choose, remember to do a complete PCT after the cycle.