Here is a list of the things you'll need to get a visa for Negara Brunei Darussalam.
Hard copy of a filled-out Brunei Visa application
Your original passport or other travel document, as well as a copy of the pages in your passport. Keep in mind that your passport must be valid for at least the next six months.
Two recently taken colour photos with a white background (passport-sized)
Your round-trip ticket to Brunei Darussalam or a copy of it
Proof that you have a place to stay in Brunei Darussalam, like a hotel reservation or the address of a close family member or friend who is willing to take you in.
Proof that you have money, like a bank statement, is required.
A pre-paid envelope with its own address (applicable to persons who are submitting their supporting documents to a Bruneian diplomatic mission via mail)
Your sponsor's letter of support
Proof that the company is registered (applicable to foreigners whose purpose of travel is for business or investment)