Welcome! I am a newbie too and I don't even have a "real" bike although I have a really nice folding bike.

I bought a used Specialized hybrid bike on craigslist for $30 and changed out the tires/seat/handlebars. The whole thing cost me about $50. I'm going to try to ride it in the winter, either outside, or if I'm too chicken, on a trainer.

Next spring, I'm going to see where I am and buy a new bike. I almost bought one recently but held back. I want to see how I do with my used bike and then decide later.

Anyway, welcome to the forum - there are some really wonderful and helpful people here and you will learn a lot!