About five years ago I wanted to start weight training so I got a book titled "Strength Training Past 50" by Westcott and Baechle. The book laid out a beginning program and provided information on developing a long term program. After the book I bought an inexpensive bench and some free weights. I have been working out three times a week in my rec room since then and I know that it has helped. I don't think I'm the type to join a gym, but working out at home has worked for me.
I would recommend looking at this book.
Best of luck.