How do I work out tube and rim strip size I have a Schwinn Men's Volare 1200 Bike, 700c. Recently had a flat. I am confused. What size tubes do I need to buy? And also the rim strip snapped. What size rim strip should I order
You need to know what caused the flat first (recommended reading here); it may merit replacing the tire itself depending on cause. 

The tube will be 700c x a-b where your tire size is between a and b. 

The rim strip needs to be matched to the rim width. See this question to measure it. Depending on why the rim tape snapped, you may need to make some adjustments to the wheel itself. 

If you take the wheel+tire to your local bike shop, they should be able to sort you out with this very quickly and even install the new tube and rim tape quickly for some nominal fee.