get beethoven's 5th. get a running app. get up and run. read "born to run".
i haven't run in three months and i started right in with 1.5 miles. i was tired and winded and my legs were sore, but i went back for more. you have plenty of time to get up to a 5k(3.1 miles). just run. couch to 5k be damned.
if some people can/want to run super marathons through death valley in the dead of summer, we can run 3 miles just about any day we want.
you can do this!