The most important item you need is a helmet, which is kind of a given, but gloves and shoes are simple items that go a long way. The benefits of having a good pair of racing gloves and dedicated shoes far outweigh the cost.
In this tech video, Kenny explains why having these basic items will help you as a driver and what the features and benefits are.
In this video, Kenny's go-to guy for safety, Ben O'Connor from Impact Racing explains what you need to know when buying a helmet. If you buy online most manufacturers provide a generic sizing chart. Ben explains where to measure your head and how to do that, but also highlights some features and benefits to having a helmet that can be customized for fit.