If I can't pay my fines will I go to jail for 60 days or until your probation is over or which ever comes first?

If you can't pay your fines, you may or could ( does not happen often and the laws varry) but they could violate your probation, and sentence you up to the entire probation time ( not just till it ends)
So if you had three years probation and 1 month left to serve, you could ( but not likely) actually be sentenced to the entire three years in jail for violation of probation