Originally Posted by
onething
Welcome!
Many of us don't do track days as often as we autocross or do time trials. I'd start with autocross if you don't have eleventy billion dollars ;)
You can enter an autocross with your car right now - assuming it is in good mechanical shape. You don't have to have a roll bar and you can use a loaner helmet until you decide to buy your own. The AX season just ended and will crank back up in March for most clubs. SCCA, EquipeRapide, Honda, Porche, and BMW all welcome Miata drivers.