Hey Lexis,
If you're still really sore, I'd say you shouldn't do any weight training today. You can do cardio as it's always great to burn off calories. With weight training you're exerting your muscles, and it's important to give them time to rest and regenerate, otherwise you risk damaging your muscles, which is contrary to your goal.
You don't have to exercise every single day, unless you really want to. If you choose to, then be sure to alternate between cardio on one day and weight training on the next. That way, you're not constantly putting your body under strain, and are giving your body valuable time to rest and develop muscle. Don't forget that you'll be doing this for a fair while, so don't place too much strain on yourself or you may not be able to sustain it.
I'm off to my weight training now so catch ya later. Let us know what you decide.