you would have to employ quite a few Turkish staff
To be accurate, that stipulation depends on the sector the business will be operating in, what form the business takes (e.g. ltd co, partnership etc) and how much money is being invested (from outside Turkey).
However, as a rule of thumb, you need to employ five Turkish nationals, for a minimum of six months, for every foreign national you wish a Work Permit for - unless of course you can get an exemption from the Ministry of Labour, or whatever they call themselves these days.
JF