My first workout was last night

Sounds like a great start! I wouldn't worry too much about soreness. There is no evidence that DOMS (delayed onset muscle soreness) indicates that you've had a good workout. Some people never get it at all even when they work to the point of exhaustion, and they still see great gains. It could be dangerous to get into the habit of thinking that you need to be in pain the next day in order to prove to yourself that you've gotten a good workout.

Personally, I tend to get major DOMS every time I do a new type of exercise, and certainly the first time I lifted. I'm also much more likely to get it in my upper back muscles than anywhere else, even if I'm lifting to exhaustion elsewhere. But even if I never feel it in my chest or biceps or whatever, I know I'm making gains because it gets easier and easier to lift weights that used to be impossible.

Once you settle into a routine, you should experiment with different ways of pushing yourself. But in the beginning, it's best just to let your body get used to the movements and take things nice and slow. Muscles adapt much faster than connective tissue, like tendons and ligaments, so it's always a good idea to ease into a weight training program rather than get overambitious and end up hurting yourself.

In other words... you're off to a great start! Keep us posted. :)

~ Vanessa