You will need a minimum of tools to be getting going with and these vary dramatically in price.
Below is a selection of tools to get you started.
Hi-Viz Vest – Essential for Marshalling.
LiPo Charger and LiPo charging bag
Drivers
1.5mm
2mm
2.5mm
Needle Nose Pliers
Ride Height Gauge
Camber Guage
Magnetic Parts Tray
Soldering Iron and Solder
Pit Mat – Saves you from searching for lost screws and parts when you are wrenching track side.