Welcome! You certainly have jumped in feet first, and FAST!
As far as sexing chicks this young -- you can look for behavioral differences, and make some guesses. A taller stance, a chesty look, more inquisitive, hopping on the other chicks. My roo did all of this quite early. (he also crowed at 4-5 weeks!)
You can also make physical observations that might help:
https://www.backyardchickens.com/threads/sight-sexing-barred-plymouth-rock-chicks-at-hatch.798635/
(I didn't know how to upload a thread properly, so hopefully that worked.....)
Leghorn or RIR experts, anyone want to chime in?
Have a plan for excess roosters, and just keep your favorites! They can be wonderful. We had to re-home ours (city limits, and he was super aggressive to all non-poultry creatures), and it took months of flyers and craigslist ads, but it can be done.
I'm with you, unless it was Zombie Apocalypse, and we were starving, I don't think I "personally" could *harvest* any of my animals, but I see nothing wrong with those who do this, and I admire their skills. If I couldn't have found a home for my rooster where he could live, I was prepared that he would go to someone who would use him for food. I wanted to make sure, if that was the case, it would be done by someone with experience, and done humanely.
Make sure you collect eggs every day. It's not like you're going to let an egg sit for 21 days, at the optimal temperature, then collect it, and try to eat it? Right? That would just be weird!

Fertilized makes absolutely no difference in taste or sight (none of my egg customers knew, or cared).
Enjoy this chicken adventure. Those stitches in your thumb have earned you serious Chicken Street Cred!