As soon as possible, find and buy a copy of Geoffrey Boothroyd's, The Handgun. Crown Publishers, 1970.
And get Elmer Keith's, Sixguns, the 1961 rev. ed.
You will be vastly better informed. These are, I think, the best basic books for new handgunners, although somewhat dated.
Of course, there are specialist books on S&W and other brands. But a good general knowledge is highly desirable.
Your 1950 vintage M&P is a nice home defense gun with some outdoors potential, too. It should serve you well. Learn to maintain it right, and it won't let you down.
And welcome to the board.