[urgent]using jsom

i need to create a item using specific content type and respective content type should have predefined metadata column value and once the item is added in list on submit button click in ui .

then we have to create a document in document library for the content type from the list item 

To implement using JSOM

UI form

Name

Category(i.e content type)

Submit button

List items

Name   Category

AA          Choice1

Document library

we have to create choice1.docx(i.e category list items) content type in document library and the metadata column values in that document will be from list item values for the respective category type

Blitz