The sentencing guidelines for ABH are on page 17 of this document:
http://www.sentencing...person_accessible.pdf
The sentences stated there refer to a first-time offender convicted after a trial. Previous convictions can push the sentencing range higher. A guilty plea, at the earliest opportunity can see the sentence reduced. (For a custodial sentence that's by one third, but it's probably not relevant here anyway).
Based upon your description of things, a Community Order looks to be a near certainty.
Chris