My arms are too sore from lifting. What cna I do about it?

So yesterday was my first time going to the gym, and I just did a bunch of lifting until my arms were sore and couldn't take it anymore. Today I'm planning on going to the gym again, but should I work on my legs instead? Maybe work on the treadmill or something until my arms becomes less sore.

Also, does taking advil remove the soreness from my arms?