If i purchase the "Creative Cloud single-app membership for InDesign (one-year)" package, will i be able to create unlimited ipad apps using the application or only one?
If you're referring to the Digital Publishing Suite, Single Edition benefit for Creative Cloud members, I believe that only applies to an entire Creative Cloud subscription (all apps), not a single app.
Confirming Steve's answer. You need a full CC subscription for that. And just to further clarify, this includes Single Edition apps only, not multi-folio apps.