Well for you as you only follow 23 channels you don’t actually have to use pagination, you can set first to 100 (the maximum) and you’ll get the first 100 results, so will get all of your follows in a single request.
For requests that have more than 100 items though, if you look at the example on the right for Get User Follows you’ll see that as well as a data array of all the follows, there’s also "pagination":{ "cursor": "eyJiIjpudWxsLCJhIjoiMTUwMzQ0MTc3NjQyNDQyMjAwMCJ9" }. To use this cursor, simply make the same API request except you’ll use that cursor value and send it as the after parameter, and then you’ll get all the results after that cursor.
If there are still more pages, the results will contain a new cursor to use and keep repeating the process until there isn’t a new cursor, at which point you should have all results.