I agree with Imccrock and Ronbert. Take what you already have and go shoot some matches.
I started with a ported 9mm EAA Witness, a cheap holster, and borrowed mag pouches. The porting put me into open class but I didn't care. I learned a lot in my first few matches. I was lucky enough to be able to practice with some local hot shooters. They gave me a lot of help, advice, and coaching which saved me a lot of coin on later purchases.
As said already, spend your money on ammo and get in plenty of match oriented practice before thinking about new equipment.