Can strongly recommend Starting Strength, started out reading the book (written by Mark Rippetoe) back in January - started the program in February using the android app* as my guide. I feel better than I've done in years (I'm in my mid thirties)
Remember to eat well and make sure you get enough protein, otherwise it's hard to follow the program.
* = https://play.google.com/store/apps/details?id=com.shabu.star...