Welcome Rick, from SE Wisconsin!

With your goals, my advice is to find and join your local bike club. I would set some intermediate goals, too. Riding with a group, you'll learn a lot very quickly and the miles just fly by. You'll soon find that 20 miles doesn't feel like a long ride any more. For me, the biggest challenge to attain the higher mileage was getting comfortable on the bike. Fitting it properly to myself, getting a good saddle, good shorts, etc.

Enjoy your stay!