Time management

Has not become a strong point for me. When I was still at the USPS I have damn near 0 time for myself. What little I did have was spent scrambling, trying to stay on top of things around the dd's and house. But ever since going out on Disability it has become more than obvious I am clueless when it comes to managing my time. The past week or so I spend the coolest part of the day doing next to nothing. I wait until the sun is at highest to get outside and get moving with the mowing and other things I need to get done. I spend a few hours in the afternoon doing what I need to....have dinner and then spend 70 minutes or so on the treadmill. I then go back outside to to spend some more time fixing the fence,mowing, rock farming etc until it gets dark. Have not been in the house before 9:30 in over 2 weeks. Play with the pup, feed the other 2 dogs & take a shower then off to bed. Extremely frustrated with how little I get done. I really do need to come up with some sort of set schedule for myself...Any suggestions??