General entry requirements

http://www.mfa.gov.rs/en/consular-affairs/entry-serbia/entering-serbia-requirements

Visa requirements

http://www.mfa.gov.rs/en/consular-affairs/entry-serbia/visa-requirements

Before travelling to the Republic of Serbia, please check whether you need a visa

http://www.mfa.gov.rs/en/consular-affairs/entry-serbia/visa-regime

Customs procedures:

Customs regulations for temporary import/export of equipment can be found here.
Customs form for temporary import/export of equipment can be found here.