It doesn't matter what the body style or who the supplier is. There are procedures to follow, and without going into a great deal of detail the best recipe I've found is
here. Follow that religiously, and you almost can't fail.
I'm not trying to put you off, but you really need to read that through to see what's involved before you even start down that road. A professional finish is not a trivial task. You need to understand the time, work and cost involved to get what you want. There's a helluva lotta labor involved, not to mention some specialized tools.
That's lacquer, though. Poly is easier, but it requires a much more specialized environment that's pretty expensive if you're not going to be doing lotsa bodies/necks. Definitely not a one-off sorta thing, unless you wanna die
really young. No less expensive, just easier. Also, more durable. That's why the OEMs/pros set up for it.
If you think you might do more than 2 or 3 bodies, we can talk more. But, otherwise, I'd strongly suggest you let someone else do the work. Tonar (on the board here) does a superlative job, if you want such a thing.
I'm curious, though. Why didn't you let Warmoth finish it? They do
incredible work
very reasonably. I've never seen better finishes, and trust me, I've seen a lotta finishes. Nobody is going to give you a better finish for less money. If you don't know how or are unequipped to do a finish yourself, it seems kinda short-sighted to buy an unfinished body.
Not trying to bat you around, just wondering.