A good place to start is by chevking out the results from previou years looking for other PRO class cars, then click on the drivers name and it will take hou to their profile page. If I've done my job there will be photos of the car and hopefully some interior snd engine shots. From these you will be able to see how they are fitted out with safety gear etc.
Also check out the build pages to get some ideas.
And of course download the rulebook and start reading, cover to cover.
Keep the shiney side up........
DLRA WebMaster / Editor