Help Me with a Routine & Nutrition

[hcartagena34]

Okay so I'm 19 years old and looking to get jacked haha. I'm 5'6" and weight 166lbs. I don't know my body fat or my 1RM for any workout but I can tell you I've been working out for a while now and seemed to have hit a plateau on bench at 205lbs and preacher curls at 50lbs. So yeah, I'm a bit overweight, definitely out of shape, but have been working on it. So some guy told me at Ballys that I should switch workouts every 2 weeks so my muscles would not adapt to the same workout, is this true? Since I want to get bigger I'm open to any one setting up a workout routine, recommending some supplements, and any tips on calorie intake, along with carbs, and any other nutritional information I need to bulk up. Thank you. Greatly appreciated.

-nutrition consist of no planning, this weekend will buy a food scale, and measuring band to take body measurements
-core workouts consist of 4x6 and auxiliary workouts consist of 4x8

Current Workout:
M-Legs & Forearms & P90x Abs
-squats-4x6
-leg curls-4x8
-leg extensions-4x8
-calf raise-4x8
-wrist curls-4x8
-reverse wrist curls-4x8
-behind back barbell curls-4x8
T-Chest & Tris & Weighted Abs
-barbell bench-4x6
-incline barbell bench-4x6
-dumbbell decline bench-4x8
-dumbbell flyes-4x8
-cable crossovers-4x8
-seated dumbbell tricep extension-4x8
-cable reverse grip pushdowns-4x8
-single arm cable extension-4x8
-dips-2xFailure
-diamond pushups-2xFailure
W-Cardio & Weighted Abs
-Elliptical
-Jump Rope
TH-Back & Bis & P90X Abs
-widegrip pullups-3xFailure (which isn't too many reps)
-barbell bent over rows-4x8
-seated rows 4x8
-lat pulldowns 4x8
-single arm dumbbell rows 4x8
-barbell curls-4x8
-preacher curls-4x6
-hammer curls-4x8
-chinups-2xFailure
F-Shoulders & Traps & Weighted Abs
-dumbbell military press-4x6
-dumbbell lateral raises-4x8
-dumbbell front raises-4x8
-rotator cuff external-4x8
-rotator cuff internal-4x8
-barbell shrugs-4x6
-bent over lateral raises-4x8

Thanks for looking, any help or comments are greatly appreciated!

[.Excalibur]

I would do 5x5, or starting strength
I would eat 3500 calories, if you dont gain weight, make it 4000