I am in the beginning phase of building a subscription service.
Simple approach...
1) Setup a WordPress site with Paid Memberships Pro
2) Add WP Courseware, if you're adding videos to each subscription/membership level
3) Drive traffic to site. Might be via talks to Meetup Groups or Facebook Ads or Traffic Oxygen campaigns.
If you provide more specifics of what you've already done + your target outcome, likely many more people can provide assistance.
