There is no definitive list for soletraders as such. The qualifying criteria for any expenses are that they are "wholly and exclusively" incurred for the purposes of the trade/profession. So stationery, advertising, rent of business premises, rates, phone, light & heat, repairs etc. all come within this.
Motor expenses are allowable but only to the extent that they are incurred in the sole trader business. So if you use the car 50% for PAYE work / personal and 50% for sole trader then the 50% of the expenses in running the car for the sole trader business would be allowable.
(yes the site is Irish based )