It's harder to do with the sim, but from my decades as an RC instructor, some tips when you get to the flying field:
1. Turn yourself slightly to face in the direction the plane is headed. Just turning your shoulders is enough, just so you are slightly looking to the side or over your shoulder. You can even do this seated in the chair in front of the computer! You'll find yourself doing it less and less as you get used to the controls. Then right will always be right, and left always left.
2. As noted, make all your turns when in the landing pattern 90 degrees. When on the downwind leg, make two 90 degree turns to get to final, trying to make a half circle is SO much harder to get to the centerline of the runway.
3. If you are facing the runway, make that final turn to end directly off of your shoulder. You will swear that you are too far in from the runway, and the plane will hit you. As you level out from the turn, just slightly face the direction the plane is going (#1 above), and you'll hit the center of the runway much, much more often!