Visit the website
www.forocepos.com or
www.donspeed.com , propose your project to see what they think of those of Forocepos, and look to see the prices in Donspeed.
Anyway, making a preparation requires patience and money, because above all, it depends on these two issues and the knowledge of the professional or the person who develops the preparation.
In the first place, you have to determine the durability that you want to give the car in km, 10,000 20,000, one season, or only a few more CV and have a car until getting bored ...
based on this, you will have to see how much money you want to put it.
And finally you will have to think about what you want to touch and how much you want to modify it, only engine, motor and brakes, suspensions, axes, body ...
When you have more or less all these clear issues, you send me a post to start advising you and even help you.