The Malaysia visa policy allows visa-free entry for up to three months to citizens of several countries, most of which are ASEAN and Commonwealth states. If you are not from the countries included on the visa-exemptions, then you will have to apply for a standard Malaysia tourist visa. Please allow plenty of time for visa application and processing. 

For info visit https://www.imi.gov.my/index.php/en/main-services/visa/visa-requirement-by-country/

If you require a visa, apply for a Malaysia Tourist Visa well in advance. International delegates may request a Note Verbale to support their application.