Forget a treadmill. It’s expensive up front, needs ongoing service, and takes up lots of room. Your best bet is to get basic strength training equipment and get a trainer to come to you. Suggested equipment:
1) Olympic style barbell
Ideally a 7′ – 45LB barbell. If room is an issue get the 5′ – 25LB version.
2) Weight plates 45LB x 2, 25LB x 2, 10LB x 2, 5LB x 2, 2.5LB x 2
Ideally bumper plates (walmart.com acctually has an “Everyday Essentials” set that is very inexpensive). Otherwise regular cast iron plates are fine. Note that even if you go the bumper plate route the 5 LB and 2.5 LB plates will be cast iron.
3) Squat rack. If you don’t have room for a rack you can get squat stands
4) Doorway chin up bar. If you cant do chin ups yet get some assistant bands.
Train 3 days per week. Hire a good trainer to come to your house and teach you how to safely perform the following lifts.
Day 1
Low bar back squat
Chin Up
Day 2
Press
Low bar back squat
Day 3
Chin up
Press
Once you get the above lifts down you’ll want to learn another 3 lifts. the front squat, deadlift, and floor press.
*If you want to bench press you”ll have to add a bench to the equipment above. Since I use the floor press as an assistance exercise for the press I don’t bother with a bench.
For Cardio take a brisk walk on the days you don’t lift. You can also skip rope or do jumping jacks for warm ups on your lifting days.