To add to what JT said, be very cautious with focusing on going fast. At this point it should not be your goal. Your goal should be (IMO) to get a running base established that you can work from. If you're able to run 30 minutes non-stop, you should feel very good about that. Most people can't. Work off of that. Slowly work your mileage up over time. If you're running say 10 miles/week now, slowly work your way up to 20/miles per week over a 3-4 months. Concentrate on form.....get smoother, and lighter on your feet. If your body feels great, you're doing it right. If something starts to ache, slow down. When you're mileage gets up in the 25-30 miles per week, then start adding a bit of speed work (moderate at first) on one run a week.....on a week when you are NOT adding any increase in mileage.
Keep in mind, hill running is kind of like speed work in disguise.
Enjoy your runs. Enjoy the fact you are healthy and running, and don't worry so much about artificial goals like having to run at a certain pace, or run a certain distance on a particular day. That will all come with time perhaps......and if not, you're healthy, fit, and enjoying one of lifes true simple pleasures.