My approach would be as follows: Begin by calculating how many Kcals you need to maintain your bodyweight at your current activity level (or just go by what you are eating now, are you gaining or losing weight, or staying the same?).
I use the following formula to figure out basal metabolic rate: BMR = 500 + (10 x LBM). In your case your LBM is about 180 so your BMR would be roughly 2,300.
To get your body's actual caloric expenditure, multiply BMR by a factor between 1.2 to 1.9, depending on how active you are. 1.2 = sedate; 1.5 = moderately active. 1.9 = works hard all day long (i.e. hard physical work).
For argument's sake I'll use 1.5 (we can fix this later if I am too low or high), so 1.5 x 2,300 = 3,450 Kcals per day for you to maintain your current bodyweight. You can and should test this by eating that amount of Kcals for a couple weeks to see whether you gain or lose weight, then figure that into your diet as you go forward.
For a clean bulk I would eat about 500 to 1000 Kcals each day above that level. For macros I would have you eat 1.5 to 2.0g protein per lb of lean bodymass (in your case about 180lbs LBM x 1.5 to 2 = 270g to 360g protein which is 1080 Kcals to 1440 Kcals). I would keep the fats at or around 100g, and not let them get above 150g, (900 to 1350 Kcals) then get the rest of your Kcals from carbs.
So to make this easy, let's round up your maintenance Kcals to be 3,500. I would then shoot for you to eat 4,000 Kcals per day to begin the bulk, of which 300g should be protein (1,200 Kcals), 100g fats (900 Kcals) and the rest (1,900 kcals / 4 = 475g) carbs.
Eat this for a month and if you are gaining more than 2 lbs per week, cut back and if you gain less than a pound per week eat more.
Perhaps the most important part of all of this will be keeping track. You need to get a food scale and weigh or measure everything you eat. And you should log it in a food journal. I use fitday. there are others out there (i'll see if I can remember their names).
