You do know that runway numbers always give the rough runway heading?
Rwy 13 is roughly heading 130, rwy 03R is 030, 21L is heading 210..and so on.
Dial in the tcn frequency, set course to runway heading, then you should be fine to land.
Otherwise look at the approach chart, the one I linked for example. They tell you how you have to fly, which altitude at which point you should have. Give it a try, it's fun to fly them, and when you are familiar with them you don't even have to look outside the cockpit. Fly it heads down watching only your instruments, and at the last nav point look up, find the runway, make a small correction and land