Pushing data from Creator to books

Pushing data from Creator to books

I am new to ZOHO.  I have had the application about 4 months.  I have an  online customer apparel business. I would like for my customer to input data in my online form, add all the items detail and  submit to Creator.  From creator, I would to be able to create an estimate or invoice based a group of items.  I know nothing about delug.  I have spent the last 2 weeks reading and watching videos.  I am more confused now than before.  Please help.

Where do I start?
I have created a form in Creator.
I have a list of items in creator that i want to push to zoho books.  the items are actual the order detail with custom detail per item.