Your turn motor and possibly even your ESC will be dictated by your local tracks' rules for racing if that's what you want to get into.

In most places, there is usually a stock class, which is usually 17.5 and then an open class which is what it sounds like and so on but most racers use nothing more powerful than a 7.5-8.5 in a truck like yours. You'll want to start in a stock class though so double check your local tracks' rules as they may also require you to have an ESC with a "blinky mode". A list of those ESC's is available here,

For the ESC, if you're going to go lower-end (i.e. not LRP, Orion, Tekin, etc.) I see no reason not to buy the HobbyWing (aka, EZrun, Xerun) ESC over anything Novak makes these days. While they are not without their supporters still, the argument can be made that their manufacturing quality and feature sets on their ESC's are now decidedly downmarket. Don't let a reputation that was made 25 years ago persuade you into buying into their "brand-name". If you absolutely have to have something Novak, their GTB2 is probably the best way to go as it's cheap enough to be treated as disposable if something goes off and/or you outgrow it. If you're willing to spend more than the cost of that model, you should be looking at a different brand, IMO.