Alex gives some good exercises for sure. I would follow this rouine as a guide to get you in shape as a beginner.
Situps, pushups, squats (50 each everyday)
Same exercises but 75 each everyday
Same exersises but 100 each everyday
Mix in a long jog at least 1x per week
This is very simple, but it works the basics very well with no equipment. It also shows work ethic and commitment by completing it everyday.