A greater percentage of Chartered Accounting firms are basically involved in Auditing. A few others are involved in Writing companys' Books of Accounts,Taxation matters, Mergers and Acquistions, Liquidation etc.
You 'll have to find out through their websites or visit their office to know their area(s) of specialization and their calibre of clients.
One skill that will most likely give you an edge is an IT skill especially with softwares that are numeric based.
Hope this little piece helps.
Goodluck!