When travelling to North Cyprus the majority of nationalities only need be concerned with having a current passport that has at least 6 months validity remaining.  Citizens of all EU countries together with Australia, Canada, Iceland, Israel, Japan, Mexico, New Zealand, Norway, Singapore and Switzerland do not require a visa prior to travelling.  Other nationalities should check with their local embassy office, or indeed visit the offices of the Turkish Republic of North Cyprus (TRNC) if they happen to have a representative in your native country.