What would you do if you wish to start out with investing, but at the same time, you are also saving for a house deposit and marriage (Singaporean living abroad here, so CPF is out of the question)?

You should start by planning out your cashflow and how much you will need for your marriage as well as your job salary. Once you have allocated your budget properly, you can then use the remainder of your money for investment.

First write/think up a priority list and discuss with your spouse.

I feel that marriage is more important than money or houses.

Then avoid debt if possible.

Maybe you want postpone expensive travelling, so downgrade on that

area.