Need some advice and guidance.

Hello everyone. I'm a 23-year-old, 183 cm tall, and around 50-53 weight. I'm a very skinny guy, which is why I would like to start working out; however, I don't know where to start. Others said that I should start eating foods that would make me gain weight, then work that off and work out. The problem is that no matter what and how much food I eat, I don't seem to gain weight. I probably have some kinda genetic thing since my grandpa had the same thing.

My goal is to gain muscles and not feel shit about myself being skinny. If I have to describe the body build that I would aim for, it would be Yuji Itadori's physique.

I don't have any equipment at home, sadly, but buying some weights is in plan, but not until I come up with a good week workout plan.

Going to the gym, sadly, is a no-go because there is none nearby.

I heard that eating meat, eggs, and other stuff could help, but idk if it does help in my case.

If anyone could give me a 4 or 5-day schedule with what to do, and how many times I need to do those specific exercises would be much appreciated.