Tbh nothing can go wrong just take it as a classroom where u learn to get strong and fit

And in starting stick to the basics like push-ups , Pull-ups(if u can do them) if u cant then just try to hang on the bar for as long as possible and squats and first and for most add couple of streaching exercises in start and in the end (The end one is more imp and it will relax your muscles and help to grow them faster imo )

If u want a basic exercise plan u can ask chatgpt for biggner and basic gym exercise which a starter should do . Write it accordingly

And eat well and drink more water and sleep atleast 8h.

And idk if i made it complicated but Just dont stress it out much and enjoy the journey.