So aim for a cheap shack, still pay my 35k tax a year. Over buying a new house that costs me something out of pocket?

It was an idea, not so much a path hence why im asking for advice.
I will be making extra repayments onto the loan when I can.i want to build my income up high enough to have a pos geared investments, but at this stage starting with very little what is my best path?

I am on my phone so I will keep it short,
My goal is to build long term wealth, I do not plan to sell this place.
I am reno’ing my current house for a resale profit, I want something I can use to build wealth on
The side. I will then use my current and newly built house to borrow for developing.