What kind of set and rep ranges are you doing? It's your first day, you will get stronger with time, don't fret.
I'm confused as to what you mean with the imbalanced squats though. Do you mean the bar is tipping and moving as you do them? I'd chalk that up to inexperience and again, being your first day. Kudos for actually using the free weight bar, though. It's just something that will get better the more you do it. I'm sure it's very natural to feel imbalanced when working with free weights at the beginning.
Yeah its exactly that, its tipping a bit.
Thanks BTW, it took me a while to work up the nerve to step foot in a gym so I'm happy I did it and I enjoyed it enough to want to do it again in 2 days. Though the burn might have something to say about that lol.