Hey, I just want to say that going to the gym even just a few days is a huge step. I'm really proud of you for taking this initiative to try to get healthy and better. I don't want to sound cliche but I've always been told that it takes 21 days of doing something to make something a habit. That's only 3 weeks.
I wouldn't worry about working out every single day. Recovery is just as important as the workout itself. You don't want the workouts to become counterproductive. And don't forget to stretch. Be careful with the weights at least starting out. May want to get accustomed to the tread mill and/or rowing machine (for upper body) before hitting the weights, especially if it's been a while since you last worked out.
Also, it can take weeks or even months of working out to see tangible results. So I wouldn't go in with hopes of losing weight after just a couple of days. Working out takes effort, discipline, and determination. Just keep your eyes on the prize and you will do great