The part about cardio goes back to what I was saying about finding something that works for you. For me, I run 6 days a week and if there's a day where I don't run, something in my brain just doesn't feel right.
So, if you're feeling up to it and want to do it, I say go for it. Get in a 2nd straight day of cardio.
One thing to keep in mind, is that despite the urge, don't initially go full-bore when getting back into exercising. It's a good way to pull something or strain something or sprain something and then the next thing you know you're out of commission for a week or so.
Also, another thing to keep in mind is to not get frustrated if you aren't seeing the results you expect or think you should be seeing after a few weeks. You see it a fair amount at the gym; a new face working out for a few weeks and then all of a sudden, poof, gone. Now of course said person could just have switched up their schedule and are coming in at a different time but more often than not they just got frustrated that they weren't down to 8% body fat with that sweet, sweet 6-pack, in like 3 weeks of working out. It takes more than a couple of weeks to get out-of-shape and it's gonna take more than a couple of weeks to get back into shape.
Should also add that the internet is a treasure trove of healthy recipes and exercises and any/everything else to keep you motivated and engaged. Same goes the gym itself. Pay attention to the exercises other people are doing and you can pick up all kinds of new stuff to try out and, if you like, incorporate into your workout.