Short answer: ID, proof of income, bank statements, sale and purchase agreement, lawyer declaration.
You need proof of identity, proof of income, bank statements showing your deposit, a sale and purchase agreement, and a statutory declaration from your lawyer. Some documents must be less than 3 months old. Start collecting them before you find a house.
Id: Passport or driver license
Income: 3 months payslips
Savings: 6 months bank statements
Agreement: Signed sale and purchase
Declaration: Lawyer statutory declaration