I see BRRRR is the most "favored" method.. how much would be a good amount saved before I start my path?

I have a seller who as agreed with me on price/terms however they are older people and are not comfortable using DocuSign or other online methods.

I’ve developed methods of sorting the listings and what not that make deals pop out.

What are some effective methods in which you can invest?

Purchase price: $35,000 Cash invested: $50,000 This was my first cash purchase and 1st BRRRR.

I am looking through options to fund my next purchase for a BRRRR scenario.

Or do I have to improve the property to up its value like the BRRRR method?

Relocated last summer from MA to Portland, ORThis state is not pro landlord from what I have read.Does anyone have experience with BRRRR residential properties, after this phase, as a landlord?

Any input you all may have on the margins and or details of this BRRRR would be greatly appreciated.  

I know there are formulas out there and methods that different folks use.Regardless of what I do the deal needs to be the right one.