Trying to get my first apartment (8 units)

I currently own 3 mobile homes, the 1st one I bought, I completely remodeled and added to it, which is my current residence, and its paid off. The 2nd one I'm about half way through the rebuild, then the 3rd one came to me, which I partnered with a friend on and it only needs a few cosmetic items fixed. All 3 of these have been owner financing with no money down. My credit score is ok I have a decent paying job, I make about 35k per year, but I have a large family so it takes most of my income to provide, in other words I don't really have any money saved, I've been trying to do everything out of pocket. It would only take about 10k to complete the 2nd mobile home, I can get about 55-60k for it once its completed, but it's going to take me another 4-6 months for that, (the 8 unit) I would like to get, is fully occupied and has a rent roll of 42k per year, I would really like to get this to help me grow faster exponentially! Any advice would be greatly appreciated, thanks in advance!