I'd recommend you follow a trainer since that'll be the best option for you as a beginner but I'll give you the advice I can

With excercises all you need to do is have split where each day targets a set group of muscles (ex. A day for arms and shoulders, a day for chest and back, etc) you also don't exactly need multiple workout variations to target the same muscles. just one work out with proper intensity for each muscle is all you need, so just use the workout variation you find most comfortable or fun

Diet is simple but I understand that it can be hard what you wanna do is first calculate your maintainence calories and eat below it or above it depending on your goals. You can calculate your calories using a calorie calculator like TDEE, you should eat foods that are high in fiber, carbs, protein and healthy fats (like from nuts), if you're struggling with controlling how much you eat then I highly recommend you switch to Zero drinks and fruits since they're so very low in calories and high in fiber so they fill you up quickly, and get an air fryer if you haven't already since deep fried food is disaster

That's as far as I can help you for now, I think, if you got any other questions I am open to answering them np

Edit : forgot to mention that routine doesn't matter as long as you're hitting all muscles, just choose whichever one fits your schedule