how do i create a bible reading plan?
Since you are posting in the biblia API forum, I'm assuming you are asking about creating a reading plan from within the Biblia website.
There is no method for doing so that I am aware of within Biblia.com.
Reading plans are meant to be created on the Logos Bible software platform, they then will synchronize with your account on Biblia.com
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As Thomas already said, to create a reading plan you would need to use logos, in the on-line version I know of this http://everydaybible.com/?utm_source=faithlifeadnetwork&utm_medium=display&utm_content=295-400x55-885-everydaybible-textad&utm_campaign=promo-advertising2014
You can visit daily to see what the reading plan is for today's date.