Monday - Chest
Tuesday - Back
Wednesday - Rest
Thursday - Shoulder
Friday - Arms(Bicep & Tricep)
Saturday - Legs
As you are just starting work every muscle individually like this atleast for 3-4 months.
As said by archtype #9 follow Jeff Nippard he does most effective and efficient beginner friendly exercises.
Also friendly advice, during the 1st month you would feel some amount of fatigue depending on your natural strength and genetics. Also never get discouraged by seeing others remember they were you at some point of time.
Hope you be sucessful and most importantly enjoy your journey brother.
As for Diet I was really fat like 101kg(222lbs) amount of fat and I got leaner so I wont be able to give you any personal advice on diet but you can check out r/bodybuilding and r/gainit