... I don't really know the difference (is it just that running is faster?)

Anyway, I've started jogging every morning, trying to get fit and lose weight etc. Jus wondering, how often should i be doing it? I'm doing 5 mornings a week at the mo, is that too little? Too much?
Only doing about 30mins each time as I'm crap and feel like my lungs are going to fall out after about 100 metres lol, which also means I only run for a few mins then quickly walk for a min, then run... etc etc. (is this called interval training?)
Don't laugh at me, I've never tried jogging before!

Thanks...