Welcome along
Decide where you will be using the car the most before start changing the parts, for example uprated/harder engine mounts are better on track but will put more vibrations through the car on tick over on the road. So probably better with new OE mounts if mostly a road car and odd track day
If you have plenty meat on your current brakes and are decent quality , Id use those and keep the sessions short and do a proper cool down lap at 50% to get rid of the heat out of the brakes/car. Changing the front brake pads to a more track focused pad is the best VFM way of getting decent brakes, but again you want to decide where the car is going to be used most. Brake fluid, I'd check when this was last changed and consider refreshing this anyway as it often gets overlooked
Get 4 x matching decent tyres on there. You can pick a second hand set up on here with track tyres on , keep a look out in the market place
If you do want any parts get in touch , I can supply various part both OE Renault and uprated. Various brakes discs, pads, braided lines, fluids, service items, Powerflex bushes to name a few