help w my diet and exercise please.

5′6" 155lbs

waist: 33

Goal : to gain up to 185lbs-200lbs

I eat 6 meals a day ( pasta, potatoe, oatmeal, whole grain bread, tuna, green beans, carrots, broccoli , nuts and protein shake)

My macros come out to be

Calories 3300

protein 250

Carbs 500

Fat 40 (saturated less than 6g)

Fibre 35

I eat 3 cans of tuna/ day

Questions:

1. When I eat this everyday , what changes can I expect to my body?

I eat a 2 cheeseburgers and 1 hash brown on weekend.
2. Should I completely avoid it?

3. Is it safe to eat 3 cans of tuna?

4. Is my bodyfat 18%?

Exercise:

I workout at home, this my routine:

Traps: Shoulder shrugs (35lbs) 4×15

Delts: side lateral rise (15 lbs) 4×15

biceps: zottman curls (30lbs) 4×15
db curls (30lbs) 4×15

forearm: DB palms down wrist curl (15lbs) 4×15
DB palms up wrist curl (15lbs) 4×15

chest: incline DB press (35lbs) 4×15
incline Db fly (20lbs) 4×15 (both exercises performed on a gym ball)

triceps: one arm DB triceps extension (20lbs) 4×15

Comments, suggestions are greatly appreciated!
Thanks