Everybody has to start somewhere. If you go racing anywhere, just explain to who ever is on race control that you've never even run a car before and you'll get put in the bottom heat(beginners/novices).
Before you have your first race you'll be able to have a practice around the track.
The best way is just to run your own race,take your time and you'll soon get the hang of it. Don't try and race the others or that's where you'll come unstuck.
Just bashing on the street won't do you much good as you will need to learn the lines of the track(s) your running on and get used to having other racers around you
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Main thing is to go and enjoy it and if your unsure about anything ask👍
Phill