From Dayton, take I-75 north to exit 93 which is route 29.

You will be able to see the High School from the top of the exit ramp. 

Turn right off the exit then left (about 100 yards) into the High School.

There are two parking lots.  You want to park in the west lot which is closest to I-75.

The soccer field is directly behind the tennis courts.

Drive-time is about 75 minutes from Beavercreek.