Step 1: Join American Film Photographers on Instagram: https://www.instagram.com/americanfilmphotographers
Step 2: Read The Negative:
Read “The Negative” by Ansel Adams. This book explains how light interacts with photographic film, and provides information on taking full advantage on the benefits of upgrading from digital to real (film) photography.
Step 3: Buy a Film Camera:
You can buy used film cameras at your local photography store, or on E-Bay or for brand new film cameras at Leica and Linhof, for example, or even a basic re-usable camera, or throw-away camera. To get some ideas on different kinds of cameras, see: The Film Photography Channel
Step 3: Buy Film:
It is always best to start experimenting with B&W film. Black and White film helps to better compose, and learn how light effects film.
Starting out, some forgiving films are Fomapan ISO 200 Creative / Fomapan ISO 400 Action / Kodak Tri-X 400.
Also for colour photography, it is easiest to start with negative film and film that offers a wide dynamic range. Films such as Kodak Professional Portra ISO 160 and Kodak Professional Portra ISO 400, or even Kodak Professional ProImage ISO 100 are great starter films with a large dynamic range.
Step 3: Develop and Process Film:
For Colour films, you can typically get them developed locally, but if not, you can typically mail them to mail-in labs.