Hi Wichwetyl,
Revive support VAST 1.0 out of the box, so I think you'll be needing VAST 2.0 which require you to buy a plugin. Do u want to use pre-rolls? After you installed the plugin and setup the inline video zone, you'll see a new tab in the zone VAST 2.0 invocation code. That contains the VAST ad tag (an uri), which you'll be needing in your JWPlayer configuration.
Im not sure but I think google DFP supports VAST 2.0 and 3.0 ad tags too and u can serve upto 90 million impressions a month with no costs. I havent used it yet though.