Swagger

Hi,

i have tested REST API  using SOAP UI 5.4.0 and now want to use SWAGGER but not sure how to start , what should i installed SWAGGER HUB/SWAGGER OPEN SOURCE TOOL.I mean have to test or create the REST API USING SWAGGER.

Kindly suggest what is needed .I am completely new to this .Is there any way to convert already created RSET API project to swagger or how to upload the project.