Your goals to double your size makes you 380 lbs, steroids or not - that is not a realistic goal. A realistic goal when not on PED's is a significant change in your physique which will make you look bigger and gaining 10 lbs a year (just starting) max of muscle unless you are genetically gifted.
You can gain more but it is only possible to put on so much muscle but you can put lots of fat on if you want to.
Keep in mind, one of the reasons for stagnation is doing too much. As
@BanditNOLIMIT said, the most important item is looking forward to going to the gym and seeing progressive overload / change in your physique but I would pick different exercises if I was starting out and doing a full body workout. Full body workouts without enough calories/the right kind of calories, you can't repair the damage from lifting before you are back at the gym which as a new lifter (potentially not doing the exercise correct, or not healed) results in injuries. Full body workouts are hard as you have to give full output on so many large muscle groups - legs, chest, back, shoulders, for examples. I would concentrate on squats, deadlifts, bent rows, pressing exercises - although it is fun to train biceps and triceps: Even though I pull with by elbows to engage my back, my biceps are getting a great workout as are my forearms as I refuse to use straps (grip strength/forearm growth), any pushing day - you can't exclude your triceps no matter how perfect you do a chest/shoulder workout. You have to press weight if you want size and every pressing exercise engages the triceps to some degree. If I was doing full body workouts - I wouldn't do biceps or triceps but that is a personal choice as I want to be able to give everything to legs, back, chest and shoulders but each to their own.
I don't like prepared meals no matter how healthy they promote themselves to be. Again per
@BanditNOLIMIT - find out your caloric maintenance limit and eat more. You mention concentrating on protein and you also want to double your size. You won't do that without a lot of carbs. Protein/healthy fat focuses diets are more for leaning out, carb loaded diets are great for energy and mass but you still need a specific amount of protein to repair.
I like preparing a large amount of food in advance and measuring it out and have it prepared in my fridge so I don't have to cook every time I want to eat. For example cook a lot of rice (measure it so you know the macros/cals), same with cooked chicken, and a couple whole eggs, and egg whites (again count the cals/macros). Make fried rice and then measure out portions and make sure you eat 5-6 times a day. Eat a lot of fruit and vegetables - you don't have to cook vegetables: some of my favourites are broccoli, peppers, asparagus (must steam), brussel sprouts, fruit -clementines, bananas, tomatoes, pineapple, and avacados. Eat at least one vegetable with each meal and mix in some fruit between meals as they are important for antioxidants, anti-inflammatory properties, and overall health.
I am not trying to put on size, but a very easy to make caloric rich, and healthy 'meal' is a smoothie - banana or two, frozen berries for antioxidant/health, a table spoon of flax/or Chia/or hemp seeds, as much greek yogurt as you want (I prefer Siggi's and you can choose how much fat by the tub macros, a scoop of whey protein or more, and depending on how many cals you want either all high protein milk or half milk/half water. Easy to digest meal. You can easily digest a high caloric/ high protein meal/decent amount of carbs and you will be hungry again in an hour or two.
Keep in mind cals in / cals out as the harder you workout the more you burn. Look at the amount of food some of the members here eat and still have abs and are lean.
I am not saying this is right - just what I would do if I was doing full body workouts and wanted to put on mass. Everyone will respond different.
Lots of good advice above from other members.
, it was exagération. If I make it to around 220 or 240lbs with minimum steroids usage and keep good health will be great!