Tried you PM you back but your Inbox was full. To get the nice paint job you need the Gloss Rustoleum White paint. This is standard paint that you can pick up off the shelf.
First, sand the plywood until it's perfectly smooth, I saw that you bought the nice plywood so this shouldn't be too much work.
Next, between each coat sand with wet-dry sandpaper, you can start with 200 grit and move up to 600 or 1000 as you add coats. I recommend three total coats, be sure you paint the edges of the plywood well and don't over-sand the edges, otherwise your nice coat of paint will end up having bare-wood showing on the corners! Be very careful during this step. You should lightly mist the surface with water before and during sanding.
On the final coat you can sand with ultra-high grit sandpaper or just buff with a brown paper-bag (equivalent to 3000 grid). Then you can choose to add a coat of clear poly. I can't recall if I did or not.
My finish has held up really well over the years, very happy with it. I've done this process on two stands with both black and white paint. The more smooth you get between coats the better the final product :)