A lesson I learnt came from a fitness guy I watched. He said, missing out one day happens. Shit happens. Missing out 2 days is a choice.
I couldn't go out yesterday cause a storm came through. So I did 2 times what I normally do. I don't know if the effects will pan out, but at least I can say I did not slouch. I am ~3lbs away from my desired weight.
Of course it's good to push yourself from tome to time, usually thats just done in a slightly smaller increments. But it's good to hear that you're talking it well.
No worries about the strength training part, first thing is to solidify training habit. Once thats done, it's much easier to slightly tweak it and slowly add or switch few walking days to resistance training days.