Welcome SuHong. The best way to stick with the sport is to make sure you have fun and the surest way to have fun is to keep getting faster. That means, drive, drive, drive. Don't worry about modifications for a little while. As @jdawson showed at the beginning of this thread ^^^, the car is very capable right out of the box. So:I am autoX noob, I started AutoX after buying Lotus Evora last year! and I can't wait for this season!
1) Get a good alignment
2) Buy at least 245 width front tires and 275 rears
I'm not sure if you are located in the USA, but find events that are close by and block off your schedule now. Buy sunscreen this year, not swaybars.