It's all good bro. I'm still on my first grow too. A couple harvests into it haha but still my first opo.
But all the question you're asking bro, they depend on other things..
The sex can show very early, or you might have to force it to show if you don't wanna wait.
If you wanna force it to show, just flip your lights to 12/12 and the sex should show within a couple weeks.
Other wide just veg it out and you'll see balls or pistils eventually.
And height varies too. It you just let the plant grow it could be 15ft tall eventually.
Look into LST(low stress training).
Indoor you have to work with you plants to keep the in line. Look thru my thread. Everything I know I share on it bro