1. you need an online stockbroker:
1a. If you only want to buy national stocks ASX / NZX you can use AUS:
https://www.selfwealth.com.au/, NZ:
https://www.asb.co.nz/asb-securities (NZ locals may know a better online broker)
1b. if you want to buy international stocks and NYSE, DOW. you can use: AUS: Commsec international trading account, NZ: ASB Securities? international trading account
2. You do NOT need a financial advisor who picks stocks for you. They have no skin in the game, and are not injured if they make bad stock picks. They injure you, and then say "Oh well, no one can predict the future!"
3. Once you've got the trading account setup, you can transfer money from your bank, then you set a buy order on any stock / ETF / LIC that takes your fancy.
4. profit.