Hi R.,
I started jogging when I was 31. I had not moved since I was 16 and I was always the slowest person in school before then. I stopped when I got pregnant with #2 at 34 and became totally sedentary (again). I ran my first marathon at 35 and I look forward to training for my second.
I have been there at the start from zero and I do have some advice:
Start with only 20 minutes. Jog SLOWLY. The important thing to do is to make it. Go as slow as a walk, but with a cadance like a jog. It isn't any harder than walking if you go slow. Once you can do that, increase your time by 10 minutes per week. Go at least 3 but preferably 5 times a week. You must rest at least one day to allow your muscles to recover.
Make it your goal to one day be able to run for an entire hour (I use "run" and "jog" interchangeably). You'll get there. Here are some things I've learned along the way:
1. There will be no perfect day to go. Just go. Forget perfect.
2. Running hurts. Everyone. The difference between those who go on and those who give up is putting up with the hurt, frustration, doubt, etc. When you finish, all the bad is gone and you feel so great!
3. I tend to focus on my failures. But the only measure of the success is the continuity of the practice. (credit Buddhist Guru Goenkaji for that saying). So if you just go, you've already won!
4. If your children can learn to lift their heads, crawl and run, you can go from walk to run. There is no reason another person can and you cannot. You can do it!
5. Your brain will try to convince you every step of the way that you cannot. Just keep going. The worst thing that can happen is that you will fall over. I promise you that won't happen in a slow twenty minute jog so just keep going and tell yourself you'll just risk falling over. Once your mind learns it won't win that battle (this takes a long time), it will stop trying to sabatoge your efforts.
6. Keep going. day after day, week after week. Make it your top priority.
7. Invest in good shoes. Go to fleet feet or Roger Soler where the look at your gait and tell you the right shoes for you. It will save you time in the doctor's office and a ton of money on chiropractor bills. Don't buy from academy, etc. It is not the same. I can't stress good shoes enough.
8. YOU CAN DO IT!! all you have to do is go.
good luck and have fun!!!
Oh check out www.mapmyrun.com to find good routes and map your distances. i use it to plan all my runs.