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The issue with pads and break fluid is heat. The OEM pads are not designed for the heat generated by repeated threshold breaking from high speeds. Once you are breaking correctly the pads will eventually crumble as you are generating too much heat. It shouldn't be a problem the first day or two but as you get faster and your technique improves you will need to go to track pads. They have a lot of different properties so I suggest listening to folks in the know and experiment a bit. The are differences in the way they bite, release, how linear they are, how long they last, how dusty, how loud, etc.
Break fluid is hydroscopic and as it absorbs moisture it boils at a lower temp. As it boils air bubbles form in the line and make the pedal mushy. So you want fluid with a higher boiling point than stick. I'm sure there is a thread on wet/dry boiling points of various fluids. I think Castrol has the highest but you pay for it. Others are acceptable too. You do need to chAnge the fluid as it absorbs water but not after every weekend but you should probably bleed the lines. Start w/OEM tires. They will squeal more and indicate when you are nearing the limits of adhesion. As you get better switch to better tires. They are stickier and you will go faster but they are quieter so the feedback while there is less obvious at first.
Most importantly, recognize that you, not the OEM car, is the bottleneck to going faster. Start considering upgrading when the OEM parts are creating the bottleneck, not you. Pads and fluids will be the first as the heat will cause break fade and you'll need to upgrade pretty soon. Then tires. Then possibly some suspension bits. But since the car is so capable out of the box, getting coilovers is likely a step too far unless you are really unhappy with the street experience and want something more compliant that can be notched up for the track - Ohlins for example. That choice depends a lot on personal preference, the ratio of track to street, and how much harshness and noise you can put up with on the street.
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