Jogging in the real world

I've never really gone running before. I've used treadmills a bit... but its certainly not the same! I've been aiming to slowly work myself up to jog for 20-30 minutes. Right now I can only manage 5 minute intervals with walking in between LOL. I enjoyed using the treadmill because I could tell how fast I was going and how far I had gone, etc. Outside I am sure my pace varies with the tiredness and terrain factors. I only have my watch to tell how long I've been going and visual landmarks to compare to how far I ran before. I've found the thing that keeps me back from going longer is I run out of breath (literally lol). Its been very slow going and with a busy work schedule I've only been out 3 times this week. Next week I have 2 maybe 3 chances to get out there, but I may be too tired lol. We'll see...