Any effort to enhance the stamina through workout and exercise should be approached steadily. Thus, you should consider the specific targets of stamina level and achieve each of them in specific time, not all at once.
For those cardiovascular routines, you should start slowly, mildly enhancing your heart rate and maintaining that level of heart rate not beyond 30 minutes for the first time. Also, increase the duration and intensity of your own performance by realistic and small intervals till you can reach the goal.
For those strength-building exercises, you should start at a resistance or weight level which is easily manageable. Gradually, you enhance the intensity and duration of your exercise to a next level over time
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