How can I print document inregular size pprint?

Not sure what you mean by "regular size print." Would you care to elaborate on what you are trying to do and also provide the make & model of the printer you are trying to print to from your iPad?

Ref: Use AirPrint to print from your iPhone, iPad, or iPod touch - Apple Support

Through AirPrint to whatever printer you're using, usually.

If you're asking about available printing settings, that depends on the printer vendor, model, and (maybe) printer firmware.

If you're looking to change font sizes, that depends on whether you're producing the document and with what apps or tools, or if you're trying to change the font sizes of an existing document such as a PDF document.