Whether you decide to export everything at once or as scenes are completed, you will need to know the proper procedure for exporting your files.
The following is what you need to do to export:
Once you have completed a scene, navigate to File | Export Animation (Ctrl + E on Windows, command + E on Mac). Here, a panel will appear giving you a wealth of options.
The frame range at the top is the same as you'll find on the top of your timeline. You can use this to dictate which frames you want to be included in this render. This can be useful if you want to test or re-render a certain portion of the animation. Given this is your first time rendering, you'll probably want to select the number of frames that your animation runs for on the timeline.
Below this is the Output format drop-down menu. This is where you can select one of the three file types we just discussed in addition to a few other image types. Select QuickTime Movie from the list of choices, as shown in the following...
