Wendy,
A couple of thoughts spring to mind...
1. Under "Options | Preferences | Count-in" it's possible to set the bar immediately before bar 1 to be a fill-in (it's under the "Lead in type" dropdown menu).
2. Begin your song proper at bar 2
- set bar 2 to an 'a' or 'b' part marker
- put the first chord in bar 1 as a 'rest all instruments' chord (e.g. C. - where the dot after C indicates 'rest all instruments'
- enter a chord on beat 4 and rest all instruments except drums (e.g. click on beat 3 and type ",C.d" - without quotation marks)
The final result would look something like the image below.
Regards,
Noel