Your appetite, diet and motivation to work out will not change overnight. Overdoing it at the start will most likely burn you out and you will quit. All 3 will increase concurrently, just build up with a simple routine.
For instance, you only need to work a muscle group 1 time per week to have gains, so you can make 1 day each week your workout day. Go for an overall total body routine that is simple to do at home. There is no need for a gym until you have built up core strength + proper nutrition + motivation.
So, a good day is Wednesday.
Pushups - youtube for proper technique do as many as you can
Squats - do full range not the halfway - google how to do it *use starting strength technique* do 10-15
Calf raises on edge of stairs - 20-25 reps is the goal
Forward Lunges - youtube how to do it do 10-15
Back Lunges - youtube how to do it do 10-15
Rest
So do all that in sequence with no breaks until finished back lunges. Repeat 3x
Now planking, youtube there are a few variations
Do the regular plank hold for 30-60seconds, release to something like yoga downward dog pose
Then bring a knee forward towards elbow as form of crunch 10x
Then bring knee forward towards opposite elbow as form of side crunch 10x
Alternate knee
Repeat 3x
If you do this once a week and in a few weeks you will want to do it 2-3x a week. By then you will be strong enough + appetite for weight training
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Meal planning is as simple as Making a bunch of food and putting it into containers. You should have a few lunchs + dinners prepared like 2-3 days worth. Rinse + repeat.
Snack should be almonds/walnuts/pistachios. Eat a large handful every single day. Each 2 large handfuls morning/afternoon for more gains.
Get instant steal cut oats and mix with peanut butter + frozen blue/black/rasp berries
eat 2 bananas each day, 1 in morning hours, 1 in afternoon.
Drink large glass of milk at least 1 per day, if not 2x
Eat 1 large serving of plain greek yogurt + frozen blue/black/rasp berries ( you can add peanut butter to plain greek yogurt and it will taste like a whipped dessert)
Boiled Eggs
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If you want lean gains, avoid wheats, if you don't care, each a lot of pasta. Pasta is full of calories.
Avoid sugars/juices/candy/soda/sport drinks
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try to make your pre made meals around solid food components
Lentil/blackbean/vegetable soups are good. You can buy
and then add frozen pea/green beans/kale
quinoa/blackbeans/tomato/cucumber/redpeppers/onion + drizzle with olive oil + cracked pepper + side dish of chickpea spread
If you are not vegan, throw chicken breast on that
boil sweet potato and diced + diced boiled eggs + olive oil + other spices = homemade potato salad OR just buy potato salad for now
brown rice/chicken/broccoli
quinoa/chicken/broccoli
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Drink a glass of water before every meal/snack you eat
Drink 2nd glass of water after a large meal IF you did not drink milk with the meal
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On Wednesday after your work out you should do 3 things
1 = drink a glass of V8 low sodium / HIGH potassium or a banana
2 = drink a vegan + whey protein shake - 40-50g protein total
3 = light stretching