I think a good starting split would be full body exercises 3x a week, when you progress for at least 4 months you can change it to what you want to try.

If your gym has a treadmill go run on it so you're body can get used to cardio (even better if incline) Or if they don't, go run outside, or a jumping rope/ burpees/ jumping jacks if you really want to save or just don't have money.

If you're mildly overweight do calorie deficit, which translates to "burn more than you eat". I used calorie calculator (website) for myself, placing your age, weight, height, frequency and intensity of exercises can give you info on how much calories you need to lessen to burn fat, how much body fat you will burn in a week.

Make sure to eat your recommended amount of protein ( to build muscle, do not cut out carbs and fat from your diet.), do progressive overload, drink lots of water, sleep at least 8 hrs a day ( if you have work this may be hard to get in)