At 6'4" and 185, you should already be cut.
Assuming you're 30 years old and work out, say 5x a week, you'd need at least 3500 calories to gain any weight. And you definitely want to favor fats and carbs on your macro break down. Basing this on your obviously ectomorph frame. Get your diet in place and consistent, then add in your gear. Start with Test 250 2x a week add in Dbol if you'd like.
There's a lot of variables that factor into anyone giving you exacting advice, variables you haven't mentioned. The more details about your caloric intake, exercise routine, lifestyle, specific goals, etc determines the best way for "you" to proceed