I'd avoid really grippy tires until you can consistently push the OEM tires to the point that you need to upgrade. A second wheelset with really durable tires (similar to OEM) might be a great idea. Keep these as your track wheels and upgrade to stickier tires as they wear out and as you progress your skill. Same with suspension, hold off for a bit, sticky tires really shine when you have the proper suspension to use them.
Brakes are a great first step (pads and fluid) since they're a major safety item and will help you with consistent brake feel after many laps. Do this upgrade first above all else. Hawk and Ferodo make great pads, there's a lot more out there to choose from. Ferodo DS2500's and Motul RBF600 fluid are at the top of my to-do list this winter.
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