What is the Minimum amount of capital I should have before I start looking for a property? 

In an installment sale, the seller can spread out their capital gains taxes over time instead of paying them all at once.

Or no upfront capital and interest go to 7% and increase monthly payment by $600 month 

What you may be referring to is the capitalized interest that happens over the course of the aforementioned 18 months.

I decided to get a remote job, establish work history, save up enough capital for my first househack while I researched and learned about markets and strategies.I'd like to create an active business and I am looking at the MTR strategy.

I’ve saved up a bit of capital during high school and my plan is to keep building it while I’m in college and start investing quickly.

If you are in the process of entering a new business, such as real estate investing, those start-up expenses are generally capitalized and can be amortized over time, but they cannot be immediately deducted.

How much capital do you have to work with?

Since it has been your homestead, you can sell the property, pocket the gain without paying capital gains.

My struggle is raising capital.