Dumb question about calorie deficits and weight loss

[Phteven]

Resistance training is weights.
If your DH has weights ask him to show you the proper form for some exercises then do 3 sets of each exercise at least twice a week (a set is 8 to 12 repetitons. I do sets of increased weight and lower repititions ie. first set is 12, then I put a little more weight on and do 10 then more weight and do eight). You should have enough weight that your set pushes you to failure. Which means that you would not be able to lift that weight again at the end of your set. After each set you have a break. To make it quicker I do another set in the break which means I do a set with one group of muscles such as tri-ceps then a set with something else ie quads then back to tri-ceps then back to quads. After 3 sets of each I pick 2 other muscle groups. If you are doing more than 15 reps that is cardio and endurance training which is good but it doesn't build large muscles. Don't fear bulking up. Women don't bulk up.

Even though you have weights I'm going to tell you to do push-ups again. They hit so many spots - start on your knees and work towards being on your toes. If you can do one push-up on your toes that means that in a week you will be able to do two. You can also do tri-cep push-ups.

And don't forget your core. Core strength is really important. It supports you for all your exercise. Get your DH to show you how to do a hover (start on your knees) and do sit-ups. There are so many types of sit-ups. I'll link you up to my favourite core workout and you can pick your favourites.
Abdominal Exercises for Boxers - YouTube

Keep in mind that when it works exercise hurts. You will feel your muscles the next day. And it's hard, but when you cheat the only person you cheat is you.
The pay-off is endorphins which make you feel foolishly happy about minor things.

Also - stretch!! Never forget to stretch.

ETA - I would say that you should start with 5 cadio sessions a week - bike, walking and Wi. Mix it up a bit. Walk one day then bike the next and so on. 2 days a week do some resistance training. You can do it on the same days as cardio. If there is a cheap yoga place nearby maybe yoga once a week and one day a week is recovery. That is important. If you are working your body hard it needs a day to rest.

ETA - 500 calories a day through exercise is quite a lot. According to the treadmill at my gym I need to run about 9 or 10kms to burn that. An hour of pump (a weights class that uses low weight in high reps to build endurance) is about 350 calories.

ETA - Have you heard of the couch to 5km program? You can download it and it will tell you when to walk and when to run the aim being for you to end up running 5km without overdoing it in the process.
One of the mistakes people make is pushing too hard to start with and then hurting too much so they take a break and lose motivation. C25K is meant to help with that.

And eating back calories - I have no idea. I eat in serves not calories and I'm not too brilliant at that. I have a protein shake for muscle gain after weights and pump.