Hi and welcome!
I think you only need an extra 250 cals or so per day while breastfeeding, maybe less. Since your baby is 6 months old, your supply is well established... and your baby will be starting solids soon. I don't think you need to worry too much about losing your supply, especially if you havne't had trouble with it so far.
Also, while some women lose weight like crazy while breastfeeding, it has the oppositie effect in some of us (me included). My body holds onto weight while bf - yours might be the same. If so, I wouldn't add any calories for breastfeeding.. I'd just start with a nice standard number (1800), try it for 2 weeks without going off plan, weigh in and reassess. If you've made little or no progress, drop it 100 for 2 more weeks and repeat (obviously assessing your milk supply enroute too!).
I lived in the country for my 1st and 2nd babies too - I was a nighttime walker. Once they were asleep/in bed, I left DH with them and went out with my earphones on for a walk/jog. It felt great to get out of the house and get away.. I still miss that fresh country air. I went in all weather - I loved to walk in the rain and snow.
You can do this - you don't need to be part of any special program or at any gym (I'm at neither). You can do lunges, sit ups, pushups and walk/jog. And count your calories (livestrong is good). that's all you need!