Whenever I do weights, I ALWAYS overdo it and everything hurts for about 2 weeks.
My wife losing weight was a bit of a catalyst to sort myself out. Hoping we can sync and do some activities together.
This is actually just something that is part of doing weights, its called Delayed Onset Muscle Soreness...DOMS. This phase will pass once your body starts to become used to this sort of activity.
On the whole i think you have an admirable goal, but you've set your limits quite hard to start with.
You should consider jumping in to the big fat weight loss thread, there is a lot of good info in there.
Generally though a daily walk is good, a step goal is very handy as its a hard target that you can break down across the day, although using the dog having a sprained wrist is not a valid reason to not walk!
Also as others have said your calorie goal is very low, you really should be consuming a higher amount i would honestly say your size and stature justifies a 2k calorie goal, add to this a 10k steps target and then try adding in some workouts.
Weight training is so underrated for weight loss. It encourages the body to maintain muscle mass, and tie this in with a high protein diet which does the same and when you lose weight, you will lose more fat then muscle this way, rather than an a more equal amount of each. Your goal is to lose fat, so you want to focus more on keeping muscle.
Good luck with your journey.