Good advice.
Make sure your fluids are fresh and topped up, maintenance is up to date, and all your consumables (tires, pads, rotors, etc) are in excellent shape as a bare minimum. In other words, make sure your car is safe.
The killer for NON-PP front brakes is cooling (due to both lack of thermal mass and ventilation). The brake cooling ducts from the Audi RS3 are cheap, easy to install, and make a marked difference. Going out in a stock configuration, I'd consider them. Upgrading your brake fluid would also be something to consider. Pads and other upgrades are definitely worth investing in as soon as possible, but if you drive within the limits of your setup, they can wait.
Something else to note - learn proper threshold braking. If you're not familiar with the concept, just search for it online. I'm sure there are plenty of articles that can explain it to you in depth. Having been tracking cars for over 15 years I can say with 100% confidence that improper braking techniques are the #1 killer of brakes. You need to be on the brakes hard, get your braking done before you begin to turn into a corner, and for the shortest amount of time possible in order to safely slow the car down.
Many beginner/novice drivers tend to brake way too early and for far too long putting completely unnecessary strain and heat into the braking system. This dramatically reduces their effectiveness and their ability to properly cool between applications. Learn the proper braking points at your track. Not only will your brakes last longer and perform better, you'll also be quicker than your friends. Win-win.
Enjoy!
The killer for non-PP cars without a LSD is xds. I'd disable it until you get a LSD.
Deflectors are a good idea, but they'll be no match for xds with no LSD.