Of course, I had to make assumptions: you're single, work W2 job that pays you over $150k, and your properties are long-term rentals. 

If you're doing this in Houston, connect with local folks, talk to experts about the rules, and think about joining groups where landlords share tips.

But know that most of these online services have subscription costs.

In your situation, you can of course "use" an agent to gather market information but bear in mind that that information might be biased so you need to do your own analysis and corroborate the info.

@Henry Lazerow is right of course.

So, I am looking for any tips that I can find to earn money without money.

All this to say every person and company is unique in their own way so of course value is viewed differently by each unique individually. 

Of course,the private lenders usually want equity.We want to move to exclusively using private money (on a debt loan) and cut out the hard money. 

I had to call about 200 lenders (no exaggeration) to learn of 4 lenders who did this and I have some tips.

@Jarrad Berman - I looked at the DR Horton development online that you were referencing - as @Dena Puliatti noted, that location has potential appreciation long term given the growth in that area, mainly because there is a lack of available land otherwise toward Madison proper and Huntsville.