Don't do all your runs flat out for a start.
Normally the advice is not to start any kind of speed work in the first few months and get some mileage into your legs. So increase the distance of one of your runs by about half a mile a week and aim to get up to 6miles but run these 'longish' runs fairly slowly.
One of your sessions try intervals. Basically run 400m in around 1:30 then rest for a minute and repeat. do 6-8 repeats.
Follow TimR's advice!
Have a search through the forum - this is a fairly frequently asked question (if you search for 1.5mile you'll get loads of results).
The best advice I've seen given is not to concentrate on the 1.5 miles, as by getting to a level of fitness where you can comfortably complete 5 miles you will (a) improve your 1.5 mile time and (b) prepare you for basic training - as you'll be going much further than 1.5 miles if you are successful.
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