You have the following options for selling your videos on demand.
1) Sell all of your videos via a monthly subscription only.
2) Sell all of your videos via monthly subscription and as a pay-per-view rental with a separate price and durations.
3) All of your videos as a pay-per-view rental and only a select number of videos in your monthly subscription membership.
4) Set all videos as pay-per-view only.
You can control the sell of each individual video by turning the subscription and rental options on or off for that video. If you turn both the subscription and rental off, then that video will be free to view.