How can I add Custom WebPart to Application Page or site page in visual studio?

hi all,

I want add custom webpart to application page in VS,

1. I create custom webpart

2. I create Application page

now I want add the custom webpart to the application page but how ?

Or if this is BAD IDEA! Is there better way?
e.g. to add Module and add aspx page and add the webpart to the aspx page?! is this better way?

if anyone has an idea or advice please tell me.

thanks in advance
Ahmad

SP 2013 & SPD 2013 & VS 2013 & MSSQL 2012