Would anyone like to critique / help me improve my workout routine:
Background:
I am 13 weeks post partum.
Whilst pregnant I had a gentle exercise routine of antenatal circuits once a week, swimming twice a week and walking most days.
Before getting pregnant I had been in a rut of eating badly, drinking beer regularly and barely any exercise. My BMI on booking in was 35 
I now have a BMI of 31.9 and am in better shape than before I got pregnant and most of the clothes that I was popping out of before I got pregnant now fit!
However, I am clearly still well into the obese category and want to seriously up my fitness so that I can run and play with DS when he is older and would like to shift about 3.5 stone. No rush on the weight loss but fitness wise I would like to be much fitter by the time I return to work (Feb next year). I also turn 30 in Jan so would like to leave unfit me in my twenties!
Current exercise routine (started at 8 weeks post partum):
Treadmill: 5 minutes walk to warm up at 5.5 - 6kmph whilst stretching arms.
Treadmill: jogging at 8kmph. When I started 10 minutes non stop was a struggle. I can now push this to over 30 (so can do 5k in total). Some days I struggle to do 15 mins (not sure why).
Kettlebells: have a 4kg and 8kg. I try and do a variety of exercises with the kettlebells. I've only just bought the 8kg and it's HEAVY so I've only used this for exercises where I hold it in both hands. I tend to do between 10and 20 minutes of exercises. A variety of arm exercises; squats; lunges, sit-ups. The plank is HIDEOUS.
I do the above 3x a week.
Other equipment available but I haven't used yet:
Skipping rope
Floor mat (I do actually use this for sit ups with the kettlebell)
Exercise step
Cross trainer (needs a cable to be fixed - haven't bothered yet as might get rid as never really enjoyed it)
Dumbbells - 3kg each
Power plate
Any tips on how to improve my work out? I am kind of tied to the house as I'm breastfeeding but actually if I fed right before my workout I probably would feel comfortable to exercise away from the house. But if I could get a good routine at home even better.
Feel free to be as harsh as you like!