First you need to subscribe for plan according the credits you need.
You need to find your own customers. Here are some tips:

• The best way is to start with friends and friends of friends, the word is spreading faster than you can imagine.
• You can create a website
• Send post on online forums
• Create a social media channel like Instagram
• Email Marketing
• You also can find customers locally.
• You can price service for your customers as you want (Normally not lower than our suggestion).
• For example you can send a 1 month line for 30$ to your customers.

Whenever you sold a subscription to a customer, you just need to open your reseller panel, create a line and send it to him.

You can even add sub-resellers that work for you or buy credits from you with a margin.

You can ask for more credits whenever you need.